SailNet Community - Reply to Topic

   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 > Gel Coat Repair Flop (Pics)
 Not a Member? 


Thread: Gel Coat Repair Flop (Pics) Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
03-12-2012 09:11 PM
maine89
Re: Gel Coat Repair Flop (Pics)

Here's an update for anyone else that tries to do this the way I did it...


Basically, if you're going to do this, I'd recommend you don't dremel or feather out the edges like I did, and instead lightly sand out the gouges to flatten the surface a bit to get better surface area and leave it at that.


After sanding I used a poly filler (White (a little gray) Evercoat Formula 27 - dried in about 20 min and sands down easily). I wet sanded the filler with 400 and 600 grit and left it slightly higher than the gouge (because I was trying to cover the mysterious blue paint below the white). Then I applied the white gel goat (mine was in a kit so I mixed in white coloring to a semi-transparent poly paste). Then I wet sanded that down to even things out but still keep it a little thicker over the poly paste because it was still showing through a little bit.

Attached are how it looks now. Worse than when I started, but my standards have fallen since then. The close up you can barely tell (yes there are a couple craters in the gel coat but since I'm leaving other gouges that stick out more, I'm not too worried about it at this point. The zoomed out version you can tell the area is darker, probably just poor color matching on my part (like everyone says, it's nearly impossible to match, and adding the hardener darkens it so it is even harder to match). I'm hoping that once I compound, polish and wax this won't stand out as much (because the hull will look "wetter"?), but perhaps it will stand out more.

Overall the money and time (days) I spent trying to fix these dings was mostly ineffective (arguably counter-productive) but a great lesson non the less! At least I wasn't messing up someone else's boat...


In other news I have a new gas tank installed and the engine runs great. Will be on the water before you know it!
03-09-2012 01:19 PM
maine89
Re: Gel Coat Repair Flop (Pics)

Quote:
Originally Posted by Faster View Post
.... OK.. sorry, I misunderstood what you typed and your pics zoned in on 'the bad'..... my bad.....
No problem I wish my deck only had those few scratches!

That is my next project.

I opted to take the next couple days off from the boat because the temperature is in the high 30s low 40s and that likely isn't good for the gel coat and the filler specifically suggested over 50.

Monday and Tuesday are back into the high 50s (heat wave!) so I'll give it a shot then and let you guys know how it turns out


Mainesail,

Thanks for posting!! I had seen in some other threads that you mentioned you used cabosil but wasn't sure how to go about using. Perhaps my evercoat poly filler is similar in similar in function?

You say that thick unreinforced gel coat is bad. How thick is too thick for gel coat? Would it only be an issue when filling the whole gouge with gel coat or could I run into issues while trying to build back up what I think I sanded away?

I've also read about the sprayer but wasn't sure how that would be done since it was so thick. I didn't know it should be thinned with acetone, thanks!
03-09-2012 11:28 AM
Maine Sail
Re: Gel Coat Repair Flop (Pics)

Couple of tricks I use;

#1 I mix my first fill of the gouge with un-waxed but already color matched gelcoat and cabosil. This prevent some shrinking and also prevents "bleed through". It makes for a great "patch" & leveler to the gouge. It also prevents the gelcoat from "crazing" and pulling away from the patch due to the thickness. Thick unreinforced gelcoat = bad...

#2 Build it up taller than the surrounding surface and let it kick.

#3 The top layer will still be tacky so I shave it off with a razor blade or sharp chisel and bring it as flush with the surroundings as you can with "manual tools" without trying to touch the surrounding gelcoat.

#4 Then, and only then, do I sand it flush. The old gelocat will sand away FASTER than the new so reserve fairing as your absolute last resort.

#5 I then tape painters paper to the hull surrounding the gouge and roll them back and tpe them to the hull creating a rounded wave type edge facing the gouge. When you spray the gel it helps to "feather" the edges of the freshly sprayed gel and helps with "blending" the repair.

#5 I then mix up some Wax-Sol and the color matched gelcoat in a Preval sprayer, with some acetone to thin it, add the MEK-P and spray the gel onto the surface being careful to not make a thick "edge" under the paper. Sorry I don't have a recipe for the thinning and I just do it by feel and experience..

#6 Let it kick, dewax it and feather it with wet sand paper. Once that is done buff it to match the rest of the hull.

#7 You will not get a good color match until you buff up the hull to a glossy finish..
03-09-2012 10:54 AM
Faster
Re: Gel Coat Repair Flop (Pics)

Quote:
Originally Posted by maine89 View Post
I know the topsides are the hull
.... OK.. sorry, I misunderstood what you typed and your pics zoned in on 'the bad'..... my bad.....
03-09-2012 02:56 AM
SloopJonB
Re: Gel Coat Repair Flop (Pics)

Quote:
Originally Posted by maine89 View Post
SloopJonB,

Trust me, had I not thought that was the way to do it, I never would have

It seemed to be unanimous online that gel coat needs a smooth surface or it will just bridge the gaps and crack easily.

I have some areas like the attached that I would love to fix (they are HIGHLY noticeable, more so than what I just "fixed") but there was no way I was going to try to sand them all out and build them back up again. Can these just be lightly sanded down the middle and then the whole area spread with gel coat? Just don't want it flaking off or something after I've done all the buffing and waxing.
I'd do one of two things - spring for a pro to spray some gelcoat over the necessary spots and rub it out myself or, pick up one of those Pre Val sprayers - sort of a cross between a spritzer and a disposable spray gun - and spray the gelcoat on myself. As long as you prep the area by thoroughly degreasing it and them wiping with good acetone, you shouldn't have any trouble with it sticking.
03-09-2012 02:56 AM
poopdeckpappy
Re: Gel Coat Repair Flop (Pics)

When you reached the point in our fourth photo, that's where I would have broke out the air bursh and fogged in the color, then wet sand ( 800 -1000, even 1200 grit ) compound then polished
03-09-2012 02:06 AM
maine89
Re: Gel Coat Repair Flop (Pics)

Quote:
Originally Posted by CalebD View Post
I guess that you saw the same webinar that I got with my course re., mixing the colors on the hull.

Yes, the gel coat will not set up without hardener in it (MEK).

Get a fully pigmented white gelcoat, scrape or sand those spots again and try again. No one will see the difference in shade from more than 20' away. What you are trying to do is to protect the fiberglass laminate below from more damage and keep your hull sound. Over (much) time the white gelcoat will weather as well; I can still see my original 'patches' up close but from a distance it is all a blur (puts on his glasses).
Are scrapes in the hull (that don't break through the gel coat entirely) potentially harmful? I have very few scratches that break the gel coat and those were the ones that seemingly needed a little more color to be fully covered. Maybe the partially transparent gel coat will be perfect for the finer scratches that just need to be faired? Transparency sure makes color matching easier
03-09-2012 02:00 AM
CalebD
Re: Gel Coat Repair Flop (Pics)

I guess that you saw the same webinar that I got with my course re., mixing the colors on the hull.

Yes, the gel coat will not set up without hardener in it (MEK).

Get a fully pigmented white gelcoat, scrape or sand those spots again and try again. No one will see the difference in shade from more than 20' away. What you are trying to do is to protect the fiberglass laminate below from more damage and keep your hull sound. Over (much) time the white gelcoat will weather as well; I can still see my original 'patches' up close but from a distance it is all a blur (puts on his glasses).
03-09-2012 01:52 AM
maine89
Re: Gel Coat Repair Flop (Pics)

Quote:
Originally Posted by Faster View Post
Just a gentle correction, maine... the topsides ARE the hull, between waterline and deck edge... What you are referring to as topsides is the deck

The more you show us the more it looks like a paint job is in order.. in which case just fill and fair, and then get some buddies and do a roll and tip job on it when things warm up...
I know the topsides are the hull I was saying that I didn't think it needed a pint job because except for the 3 dings in that one area I tried to fix, and the random scratch section (must have be rubbing on something) the topsides/hull is beautiful. There are two other scrapes in the blue stripe but I'm trying to forget those since matching that blue would be a real challenge (but I'll probably try anyways, can always wipe it off...)

Note: Black streaks have since been wiped off one of those attached photos.
03-09-2012 01:40 AM
Faster
Re: Gel Coat Repair Flop (Pics)

Quote:
Originally Posted by maine89 View Post
Siamese,

The topsides are actually in great shape.....
Just a gentle correction, maine... the topsides ARE the hull, between waterline and deck edge... What you are referring to as topsides is the deck

The more you show us the more it looks like a paint job is in order.. in which case just fill and fair, and then get some buddies and do a roll and tip job on it when things warm up...
This thread has more than 10 replies. Click here to review the whole thread.

 
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


All times are GMT -4. The time now is 03:17 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

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.