Look at this gelcoat condition, please - SailNet Community
LinkBack Thread Tools
post #1 of 7 Old 07-19-2010 Thread Starter
moonie5961's Avatar
Join Date: Oct 2008
Posts: 40
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0

Last edited by moonie5961; 10-29-2011 at 10:42 AM.
moonie5961 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 7 Old 07-19-2010
Special Delivery
speciald's Avatar
Join Date: Mar 2007
Location: live on boat
Posts: 661
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Send a message via Skype™ to speciald
A friennd of mine had his boat re-gelcosted instead of painted. I never heard of that being done. It was done in Trinidad and cost less than Awlgrip.
speciald is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 07-19-2010
ASA and PSIA Instructor
Join Date: Apr 2000
Posts: 3,670
Thanks: 10
Thanked 30 Times in 30 Posts
Rep Power: 17
I'd say the dark spots are blister divots that have been repaired with a filler. Interlux Watertite sets up pea green/purple. If the stuff is all solid and dry, my experience is...leave it alone. If the boat was in the water for a season, and you cannot see any evidence of active blistering, roll on a few coats of Interprotect just as a base for fairing, paint and go.

Certified...in several regards...
sailingfool is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 07-20-2010
Senior Member
kd3pc's Avatar
Join Date: Oct 2006
Location: Callao, VA
Posts: 1,419
Thanks: 0
Thanked 16 Times in 16 Posts
Rep Power: 10

having had a few old boats, I think you are seeing "old" barnacle attach marks...sometimes the scrape and paint is not as good as it should be, and although the barnacle is no longer there, the "adhesive" they use causes a different surface for the subsequent layers of paint to adhere/not adhere...a little old age, a little mildrew/water trapped, a little bottom paint from the 70's and 80's and back then we used some weird colored primers and surfacers to try and get the bottom paint to stick better...

looks pretty good for a boat that age...
kd3pc is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 07-20-2010
Senior Member
Gene T's Avatar
Join Date: May 2006
Location: Left Coast USA
Posts: 666
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
I seem to remember having a bottom job once where the yard used a purple primer for some "New" bottom paint that was supposed to be very good. I can't actually remember if it was or not. I don't remember keeping the boat long enough to find out.

Boats of that age used very thick gel coat which would get air bubbles and pop off leaving a shallow depression which would get filled with bottom paint or primer or?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Currently in Long Beach, CA
Gene T is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 07-20-2010
Senior Member
Join Date: Aug 2009
Posts: 208
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Well, obviously pictures aren't as handy as seeing the boat directly, but it looks like maybe some of the crazing isn't crazing so much as scratch marks. Maybe you used an agressive-grit sandpaper? Or a slightly beat-up scraper? I've never cleaned bottom paint - especially through a layer or two of barrier coat - and not scraped up the bottom a fair bit. I'm sure I'm not saying anything you don't already know when I suggest that crazing usually occurs around stress points - fittings, chines, 'grounding surfaces', etc. But it looks like you've got marks all over the place, which suggests that not all of it is crazing.

So if a some or most of those scratch marks aren't crazing, then it's not such a mysterious situation.. you simply have a quasi-pockmarked hull that's been filled with all sorts of things over it's life. Different coloured things.

If delamination is your concern, there are some pretty sophisticated tools that can measure such things. But from what I see, there's nothing to suggest any significant issues. In my experience, if the gelcoat is compromised, it's not difficult to peel away the damaged areas with a fingernail. I don't see anything like that going on here.

Additionally, since you sanded down to the fiberglass in some areas (I assume those areas are/were areas where there was some questionable 'stuff' going on) and didn't see any opaqueness from non-wetted glass, I hesitate to get excited.

I would take another look around, see if there are any obvious damage spots. If not, I'd simply sand, put on a healthy barrier coat, a good thick (extra coat or two) of ablative, and smile about the fine, fine hull you've got.

... or I'm wrong.

Living aboard, currently in the Chesapeake
O'Day 37, still new to us
CapTim is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 07-20-2010
Join Date: Apr 2006
Posts: 12,071
Thanks: 6
Thanked 160 Times in 157 Posts
Rep Power: 12
Crazing and pox and glecoat aside...It sure LOOKS like the patchwork quilt of previous repairs and coatings. If what you have is solid (not gooey, no loose) and looks stable, I'd say to clean it, prep it, apply a couple or three layers of barrier coat and then the topcoats of your choice.

You could also try emailing maximum-detail pictures to a couple of the companies that make epoxies and barrier coats and blister repairs, asking them if any of the colors or work seem familiar to them. (WTF, they won't charge you for it.)
hellosailor is offline  
Quote Quick Reply Share with Facebook

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
restoring gelcoat - Need Help Summercamp Gear & Maintenance 12 10-02-2009 08:13 PM
Repairing Gelcoat Cracks and Chips Don Casey Gear and Maintenance Articles 0 11-06-2002 07:00 PM
Recovering the Shine Don Casey Gear and Maintenance Articles 0 08-04-2002 08:00 PM
Cleaning Fiberglass Hulls and Decks Sue & Larry Gear and Maintenance Articles 0 03-07-2002 07:00 PM
Cracking Gelcoat Dan Dickison Gear and Maintenance Articles 0 12-17-2000 07:00 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome