How to repair very small crack in Escape Rumba (13' plastic sailboat)? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree4Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 05-28-2012
Junior Member
 
Join Date: Jun 2011
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
DanielF is on a distinguished road
How to repair very small crack in Escape Rumba (13' plastic sailboat)?

I picked up a ten year old Escape Rumba the other day for $50. The only problem with it is a very small crack - 2.5" x 1/8" - towards the back of the swing keel slot (is this called the trunk?). It's in the slot, but just barely, e.g. it is easily accessible. See below photo for reference.

How can I patch up the crack? Can I simply use an off the shelf caulking, do I need to use some marine specific sealant or silicone, or is my best bet going to be a plastic weld?
Attached Thumbnails
How to repair very small crack in Escape Rumba (13' plastic sailboat)?-dsc_2420.jpg  
Reply With Quote Share with Facebook
  #2  
Old 05-28-2012
CorvetteGuy's Avatar
72 C&C Corvette
 
Join Date: Jun 2011
Location: PHYC
Posts: 318
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 4
CorvetteGuy is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

I would think a 2 part epoxy of sorts, chalking is for doors and windows.
Reply With Quote Share with Facebook
  #3  
Old 05-28-2012
Junior Member
 
Join Date: Jun 2011
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
DanielF is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

Quote:
Originally Posted by CorvetteGuy View Post
I would think a 2 part epoxy of sorts, chalking is for doors and windows.
Actually my thinking was that, because the boat is plastic, the rock hard epoxy would not work so well. I've worked with epoxy and fiberglass before, though not in the context of boats.
Reply With Quote Share with Facebook
  #4  
Old 05-28-2012
svHyLyte's Avatar
Old as Dirt!
 
Join Date: Nov 2008
Location: Tampa Bay Area
Posts: 2,546
Thanks: 11
Thanked 84 Times in 80 Posts
Rep Power: 6
svHyLyte is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

You might want to take a look at this Polyethylene Repair Kit
__________________
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
Reply With Quote Share with Facebook
  #5  
Old 05-29-2012
Propertydoctor's Avatar
Junior Member
 
Join Date: Jul 2011
Location: Florida west coast
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
Propertydoctor is on a distinguished road
Smile Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

Hi Daniel!

First, please stop by the Escape Rumba Help forum here Escape Rumba Help
We would love to have you join us.

Second, crack repair.
DO NOT try to use any polyurethane or silicone. Silicone just doesn't stick and polyurethane actually leaches the plasticizers out of the plastic making any plastic it touches become brittle over time.

You can NOT use any of the hard setting epoxies for this repair. The only epoxy on the market that will work is G-Flex by West Systems. With a little prep work this product will work for you. Their website has a good video on the product. G-Flex Torture Demo I bought my kit at my local West Marine store.

An even better repair and the way I completed 3 major crack repairs on my Rumba is to weld the repair from the outside and then reinforce the repair from the backside with the G-Flex product and some fiberglass tape. I used the Plastic Welding Kit 80 Watt Iron from Harbor Freight . Buy 2 because they are inexpensive and the tip will probably break off of at least one of them.

FYI- A local (Sarasota, FL) kayak shop quoted me $50 plus $20 an inch to weld the cracks with no guarantee. Had I gone that route I would have more in the welding than what the boat cost me.

To get to the back of the damaged area to place the G-Flex and fiberglass, you will have to cut an access hole in the deck to work through. This accomplishes a couple of things for you. The piece you take out provides you with guaranteed compatible material to use as welding filler so the access hole is the actual 1st step.

After you're done backing up the welds the access hole needs to be filled and for that you will use a 4" or 6" deck plate with o-ring. This will provide you with the ability to inspect your repairs periodically and also provide ventilation to help dry out the interior of the hull after sailing.

WAIT! DRY OUT THE HULL! Yep... Of 4 boats that I have recently seen, 3 had cracking under the stainless mast and boom step and mine, in addition, had two 6" -8" cracks in the bottom of the hull at the leading edge of the runners. I repaired all of the cracks on mine exactly as described above, and feel confident that this was the right way to handle the repairs. I am still going to inspect the inside of the hull before and after every sail, though.

I hope this helps! Please feel free to post any further questions you may have or email me directly if you want.

Good Luck!
Robert
DanielF and Ritchard like this.

Last edited by Propertydoctor; 05-29-2012 at 12:58 AM.
Reply With Quote Share with Facebook
  #6  
Old 05-29-2012
Propertydoctor's Avatar
Junior Member
 
Join Date: Jul 2011
Location: Florida west coast
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
Propertydoctor is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

I looked at the kit svHyLyte suggested, too. I found the torch method to be very difficult to manage and I didn't feel confident that the welding material provided would be compatible with the plastic in my boat. It definitely looked different.
Good suggestion though!
Reply With Quote Share with Facebook
  #7  
Old 05-29-2012
Junior Member
 
Join Date: Jun 2011
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
DanielF is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

Quote:
Originally Posted by Propertydoctor View Post
Hi Daniel!

First, please stop by the Escape Rumba Help forum here Escape Rumba Help
We would love to have you join us.

Second, crack repair.
DO NOT try to use any polyurethane or silicone. Silicone just doesn't stick and polyurethane actually leaches the plasticizers out of the plastic making any plastic it touches become brittle over time.

You can NOT use any of the hard setting epoxies for this repair. The only epoxy on the market that will work is G-Flex by West Systems. With a little prep work this product will work for you. Their website has a good video on the product. G-Flex Torture Demo I bought my kit at my local West Marine store.

An even better repair and the way I completed 3 major crack repairs on my Rumba is to weld the repair from the outside and then reinforce the repair from the backside with the G-Flex product and some fiberglass tape. I used the Plastic Welding Kit 80 Watt Iron from Harbor Freight . Buy 2 because they are inexpensive and the tip will probably break off of at least one of them.

FYI- A local (Sarasota, FL) kayak shop quoted me $50 plus $20 an inch to weld the cracks with no guarantee. Had I gone that route I would have more in the welding than what the boat cost me.

To get to the back of the damaged area to place the G-Flex and fiberglass, you will have to cut an access hole in the deck to work through. This accomplishes a couple of things for you. The piece you take out provides you with guaranteed compatible material to use as welding filler so the access hole is the actual 1st step.

After you're done backing up the welds the access hole needs to be filled and for that you will use a 4" or 6" deck plate with o-ring. This will provide you with the ability to inspect your repairs periodically and also provide ventilation to help dry out the interior of the hull after sailing.

WAIT! DRY OUT THE HULL! Yep... Of 4 boats that I have recently seen, 3 had cracking under the stainless mast and boom step and mine, in addition, had two 6" -8" cracks in the bottom of the hull at the leading edge of the runners. I repaired all of the cracks on mine exactly as described above, and feel confident that this was the right way to handle the repairs. I am still going to inspect the inside of the hull before and after every sail, though.

I hope this helps! Please feel free to post any further questions you may have or email me directly if you want.

Good Luck!
Robert
Thanks for the tips, Robert! Is the fact that the crack is ever so slightly recessed in the rear of the keel trunk going to be a problem here? I would've done a duct tape weld like on my Sunfish had the surface been flat, but that would be difficult in this case. Also, do you think I'll even be able to get an access hole in the correct spot? The below photo shows the proposed location of said hole, but until I measure the crack distance from the transom I won't know if the hole will even be directly above the crack. Furthermore is placing an access hole in an area in which it could be stepped on going to be a problem? How do we seal the hole if I can't use silicone? As always, you input is very much appreciated.

Thanks!
Daniel

p.s. The other quirk about this particular boat, which I picked up for a mere $50, is a missing boom Going to first hot bend a custom boom out of some PVC before I bother with the expense of having one made from an aluminum tube.
Attached Thumbnails
How to repair very small crack in Escape Rumba (13' plastic sailboat)?-rumba_access_hold_proposed.jpg  
Reply With Quote Share with Facebook
  #8  
Old 05-29-2012
Propertydoctor's Avatar
Junior Member
 
Join Date: Jul 2011
Location: Florida west coast
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
Propertydoctor is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

Daniel, the most important thing to remember when working on and repairing the poly boats is... they aren't fiberglass. The advantages of a poly boat are they are practically impervious to chemicals and they are strong but flexible so they fend off most impact damage. Both of these positives are also negatives when it comes to repairing this material. I have used a duct tape bandage on my Sunfish too but the same type of fix won't last very long, underwater, on a poly boat, especially at the back of the centerboard trunk.

When I got your reply I went out to my boat and checked a few things and took some pictures for you. If the pictures don't show up in this post you can look at the album SailNet Community - Propertydoctor's Album: Escape Rumba crack repairs.

Yes, you can get a 5" deck access plate in the spot where you need to make the hole. From my quick look I think you will be within easy reach of the backside of the crack. These plates are made to be walked on so they will take sitting on them fine. When you buy a plate, make sure it has an o-ring seal, otherwise you will have water leaking into the hull from the plate.


Silicone is an excellent product when it is used as intended. That being said, silicone was never intended to be a very strong adhesive and because of the impervious properties of poly, the silicone can't make a chemical or mechanical bond with the plastic. BUT! If you use silicone under the flange of your deck access plate and install it loosely until the silicone cures, then tighten all of the fasteners against the backing plate, the silicone makes an excellent watertight gasket.


For my backing plate I used a cheap poly cutting board from Wal-Mart. The cutting board was about 3/8" thick and was rigid enough to stabilize everything when the stainless flat head machine screws with nuts and lock washers got tightened down. You will have to cut the backing plate so it will fit the flange of the deck access plate and I recommend clamping them together and pre-drilling the holes. Mark a reference point on both so you keep the backing plate oriented correctly in case any of the holes are off. You will also need to make a cut across the ring of the backing plate so you can twist it through the hole like you would put a key on a key ring.


Another thing to remember is, you do not want to install your deck access plate before you make your repairs. You want as much room as possible to get your arm into the hole and do the work, as it is you will be working blind inside the hull. You also do not want to get any epoxy on the threads or the o-ring, or you will be buying another deck access plate.

Here are some pictures of the epoxy/glass repairs on the inside. The dark marks you see are sharpie marker points I used as reference to make sure the glass tape was over the crack. I did use 2 layers of fiberglass cloth tape, the first layer was 2" wide and the second was 4". I used the G-Flex epoxy and followed the instructions for "flaming" the plastic for better adhesion.



You will find the PVC boom is not strong enough to handle the loads imposed by the main. You can definitely use the PVC as a way to work out the dimensions and then use that pattern to fabricate your aluminum to. Keep in mind, the boom is sheeted at the mid point, there is enough stress at that point to fold a PVC boom in half. Maybe you could make the PVC boom and then insert a straight section of aluminum tubing to reinforce the length. Huh... interesting idea. I might just play with that on another boat I have.
I don't know how much you know about the SmartRig but it is a variation of a product called the Hoyt Jib boom http://www.forespar.com/pdf/techTips...t-Jib-Boom.pdf. Gary Hoyt is definitely a smart man.

Hope all of this helps and isn't too confusing. Let us know how your making out.

Robert
Barquito and Ritchard like this.

Last edited by Propertydoctor; 05-29-2012 at 10:09 PM.
Reply With Quote Share with Facebook
  #9  
Old 05-30-2012
Ritchard's Avatar
No more curry buffets
 
Join Date: Aug 2011
Location: Toronto
Posts: 379
Thanks: 2
Thanked 5 Times in 5 Posts
Rep Power: 3
Ritchard is on a distinguished road
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

Hats off to Robert for awesome and helpful posts in this thread.
__________________
Bashing about on Lake Ontario and Beyond
"Ariel" '79 Endeavour 32
Reply With Quote Share with Facebook
  #10  
Old 05-30-2012
deniseO30's Avatar
Move over Joan Rivers!
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 5,856
Thanks: 51
Thanked 72 Times in 64 Posts
Rep Power: 9
deniseO30 will become famous soon enough deniseO30 will become famous soon enough
Re: How to repair very small crack in Escape Rumba (13' plastic sailboat)?

Ahem; We repaired the poly water tank on my boat 3 years ago and it's still holding, even when the vent tube doesn't vent and the tank gets some pressure in it. It works! 3M Scotch-Weld DP8005 Acrylic Adhesive
__________________
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

my current "project"!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Escape Rumba Help KnotRight Introduce Yourself 15 12-15-2012 12:06 PM
How to repair crack davidpm Gear & Maintenance 6 09-21-2011 07:53 PM
Hull Crack!! How to repair? scottchop Gear & Maintenance 7 03-22-2010 04:04 PM
Small crack and rust stain on the side of the keel ichorniy Gear & Maintenance 8 01-11-2009 04:11 PM
Rudder Crack Repair rheaton Gear & Maintenance 14 04-14-2008 09:37 AM


All times are GMT -4. The time now is 04:36 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012