Gelcoat void repairs -help- - 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? 
  #1  
Old 06-12-2009
BugsBunny's Avatar
Junior Member
 
Join Date: May 2009
Location: Colorado
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
BugsBunny is on a distinguished road
Gelcoat void repairs -help-

Hi all,

So this week, at the suggestion of a friend, I rented a power-washer to remove the old flaky anti-foul coat. Doing so revealed what I believe to be gelcoat voids. There is absolutely no wetness, toxic / stinky fluids. I have revealed hundreds of them and fibers of what I believe to be the skin-up mat behind. I've decided to stop the power-washing for the moment, thinking perhaps I am causing more of a pain for myself than necessary…

I am curious of your thoughts on a couple of options:

Should I continue to power-wash and reveal all the “loose” voids and then repair? My thought here is to go ahead and get it over with.

Should I just scrape (by hand) the rest of the anti-foul coat off, sand, epoxy fill the current crop of voids, sand again, probably barrier coat (might as well, since there is some sort of void problem) and then anti-foul-coat, then sail.

Picasa Web Albums - BugsBunny

If you don’t mind looking closely at the last pic in the album, you will find “bubbles” that haven’t been removed. These are what makes me wonder if this is a sign that I should continue removing all the “bubbles” as some look to have hairline fractures on their edge that I wonder, if in time, will allow water inside, causing future damage. Or will a solid couple of coats of barrier (Interlux2000e) take care of it?

Finally, to those who have done epoxy filling under a boat -on a trailer- do you have recommendations as to how to make this process quick but effective? Don’t worry about the safety advice, I am very familiar with nasty chems and metals and take over-the-top precautions.

Thanks tons!

Last edited by BugsBunny; 06-13-2009 at 03:53 PM. Reason: Much better clarification in this version.
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 06-15-2009
BugsBunny's Avatar
Junior Member
 
Join Date: May 2009
Location: Colorado
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
BugsBunny is on a distinguished road
decision so far...

I am leaning toward the rationale that continuing to powerwash will expose all the loose voids and, unfortunately, cause more work for me. My logic being "do it right one time instead of halfway 3 times". If they are popping out it's because it's their time to go.

My question now is practical: assuming I choose an appropriate epoxy (I can't remember what type is recommended on gelcoat, but I'll look again), how realistic is it to simply "spatula it on". Having never physically done this work is it really so simple? Simply squirt a bit on the affected area and then "Squeegee" it into the holes? I just want to know that (as I will be working against gravity under the boat) that the epoxy isn't going to just plop out of the holes once I fill them. Is the stuff so thick and pasty?

Do I really need to dremel them out first?

Picasa Web Albums - BugsBunny

Would it be better to get some syringes and squirt into holes; and then spatula; and then sand flush after cure? Or skip the syringe (sounds silly now that I ask)? I only ask because of the thought that air pockets could get trapped the voids as I spatula.

Thanks everyone for taking the time to help someone not so familiar with fiberglass repair...
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 06-15-2009
celenoglu's Avatar
Senior Member
 
Join Date: Dec 2008
Posts: 580
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 7
celenoglu is on a distinguished road
Continue washing with the power washer. Apply one coat of epoxy with a roll, make sure it covers all the voids. Then apply epoxy with ground glass fiber to the voids with a spatula and apply a second layer of epoxy. If your hull is dry this will keep it dry from now on. If the hull is not dry (use a humidty meter.) Wash the hull with water and let it dry. This might take some time from a few weeks to two months. Apply the epoxy coatings after the boat is dry.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 06-15-2009
ASA and PSIA Instructor
 
Join Date: Apr 2000
Posts: 3,497
Thanks: 7
Thanked 19 Times in 19 Posts
Rep Power: 15
sailingfool will become famous soon enough
You need to fill the voids with Interlux Watertite or an epoxy paste such as West System epoxy mixed with colloidal silica. These adhere great and have the consistency of peanut butter and will not run or drip.

You need to do your filling first.

Your pictures show lots of little bumps which are voids-in-waiting. If you are going to repair this bottom you need to remove them also.

The right way to fix this bottom is to have a professional use a bottom peeling machine to remove the gelcoat and whatever underlying material have voids, following which someone (probably the pro) replaces same with new material, except your five coats of Interprotect substitues for the gelcoat. This type of fix is expensive...think $150-$200 per foot.

What you should do is just leave the bottom alone, repaint and enjoy the boat for a year or two. Then kick the problem down the road to the next owner.
__________________
Certified...in several regards...
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 06-15-2009
cruising all I can
 
Join Date: Apr 2007
Posts: 1,117
Thanks: 3
Thanked 23 Times in 18 Posts
Rep Power: 8
joethecobbler is on a distinguished road
Couldn't you pressure wash and then sand/grind to give the surface some "tooth" then wash down w/ sope and water , check for the proper moisture the a quick wipe w/ acetone , air dry and then start rolling or painting on the epoxy? I've seen this done. I haven't seen it come out after a year or two, but it looked decent.
I have a couple years experience using epoxy on different marine repair projects and it's important to note that you can get epoxy in different grades or thickness (vicosity ? ) I prefer the medium viscosity 50/50 variety as it makes mixing it alot simpler. I don't care for the west as it is difficult to get the mix correct. If you get it wrong it won't "go off" or get hard. and is a real treat to remove if this happens.
I bought 10 gallons a while back and use it on just about everything ! it is alot less obnoxious to work w/ and be around than polyester resin (fiberglass). And is 100% non permiable I believe. Although it doesn't like UV and needs to be covered/painted etc.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 06-15-2009
Here .. Pull this
 
Join Date: Jan 2007
Posts: 2,031
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Sailormann will become famous soon enough
It depends on how much the boat is worth to you. If you like her and want to keep her, then invest in the bottom peel and sail worry free for the next 30years. If you don't want to spend a lot of money then just finish with the powerwashing and get everything opened up. Let it dry for a while then fill it and fair it with thickened epoxy and then give it 6 or 7 coats of unthickened medium viscosity stuff.

If you don't do anything the boat will get worse quite quickly.

Good luck.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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
Thin gelcoat - how thin is too thin? laHolland Gear & Maintenance 9 06-06-2009 12:19 AM
Blisters Michael201 Gear & Maintenance 5 02-07-2009 06:36 PM
Fill that hole GoodOldBoat Good Old Boat 0 07-23-2007 10:54 AM
Repairing Gelcoat Cracks and Chips Don Casey Gear and Maintenance Articles 0 11-06-2002 08:00 PM
Recovering the Shine Don Casey Gear and Maintenance Articles 0 08-04-2002 09:00 PM


All times are GMT -4. The time now is 02:19 PM.

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

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.