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Stress cracks in gelcoat

Old 01-17-2019, 01:04 PM
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Default Stress cracks in gelcoat

How do you repair stress cracks in gelcoat. I nave had several repaired by the boat yard but it starts to get pricey. I assume its a talent/art to get the correct match. Any help appreciated.
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Old 01-17-2019, 02:10 PM
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That’s like asking how do I do brain surgery.
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Old 01-17-2019, 02:15 PM
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Originally Posted by noah8503 View Post
How do you repair stress cracks in gelcoat. I nave had several repaired by the boat yard but it starts to get pricey. I assume its a talent/art to get the correct match. Any help appreciated.
youtube is your friend...
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Old 01-17-2019, 02:26 PM
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Usually you dewax, hand sand with 600wet, dry, spray then sand with 2000 wet, then wax after a few days of drying time.

But the pigment match can be tricky on smaller areas unless you can use a really thin model airplane brush to fill just the scraped out dewaxed cracks.
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Old 01-17-2019, 02:41 PM
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Watch Andy Miller on Boatworks Today on your computer. He has been doing stress cracks recently,and he does them right.
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Old 01-17-2019, 03:26 PM
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Originally Posted by r-joy View Post
Watch Andy Miller on Boatworks Today on your computer. He has been doing stress cracks recently,and he does them right.
+1 for Boatworks. Here's what you need:
Some great advice on using flexible epoxy if your cracks are caused by the boat structure flexing. I did do a bunch of stress cracks in my floor with a more traditional solid resin, but those cracks were all from things being dropped - I had plenty of underlying stiffness not to have to worry about flexing. So, follow Andy's advice, and choose the right resin depending on the type of stress cracking.
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Old 01-17-2019, 03:28 PM
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LOL I was just going to post that,
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Old 01-17-2019, 03:30 PM
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They usually come back unless you grind out deep enough to lay matt with resin
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Old 01-17-2019, 05:18 PM
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X4 on Boatworks Today!
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Old 01-17-2019, 05:42 PM
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Oh boy. With that thread title, the chum bag is in the water, a chunk of bait, rod in the rod holder. Now, we sit and wait. Patience. He'll show up.
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Old 01-17-2019, 06:13 PM
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I love this subject and there's hardly a week goes by when there not a couple of stress crack posts !
What causes this to happen ??
Its really quite simple to virtually eliminate it from happening so much OR even completely !
The manufactures need to yes better gel coats !!
Yes the gel coat used is to brittle !!
Use a more slightly flexible gel coats and problem goes away !
CHINESE small boat manufactures here ALWAYS use this MORE FLEXIBLE kinds of gel coat for there export boats sent out of the country !!
ELIMINATES REPAIRS !! Plus over time I have changed the laminating and construction methods AND MATERIALS ,using better glasses TO stiffer laminates so this combined !! , NO STRESS CRACKS EVER IN THE LAST 6 YEARS I BEEN HERE ,SO NO REPAIRS !!
SIMPLE AH !
You can lay this problem straight on the shoulders of the manufactures so it they used the noodles and thought a little and trained the laminating and gel coat staff better this problem could be history in a short time !
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Old 01-17-2019, 06:24 PM
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Originally Posted by seacat22 View Post
oh boy. With that thread title, the chum bag is in the water, a chunk of bait, rod in the rod holder. Now, we sit and wait. Patience. He'll show up.
fish on...!!!!!!
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Old 01-17-2019, 06:29 PM
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Originally Posted by SeaCat22 View Post
Oh boy. With that thread title, the chum bag is in the water, a chunk of bait, rod in the rod holder. Now, we sit and wait. Patience. He'll show up.
Are you the reincarnation of nostradamus?
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Old 01-17-2019, 06:31 PM
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Originally Posted by noah8503 View Post
How do you repair stress cracks in gelcoat. I nave had several repaired by the boat yard but it starts to get pricey. I assume its a talent/art to get the correct match. Any help appreciated.
my experience is the best at it charge the least. boat yards tend to do a shit job and charge a fortune. you need to talk to your boat neighbors and see who they recommend. i would of course only use a legit person, and make sure they are insured. during busy season these guys can have a wait list of months and then stop taking on new work.
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Old 01-17-2019, 06:37 PM
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Originally Posted by SeaCat22 View Post
Oh boy. With that thread title, the chum bag is in the water, a chunk of bait, rod in the rod holder. Now, we sit and wait. Patience. He'll show up.
Ya nailed it,,,
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Old 01-17-2019, 06:40 PM
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Originally Posted by TwentyFourSeven View Post
They usually come back unless you grind out deep enough to lay matt with resin
Maybe. The trick is to grind back back to the fiberglass. If you see an underlying crack in the fiberglass then yes, you have to fix that. But if you grind out the gel and get back to solid ground, and if there is no give or sponginess around the crack, then filling and fairing works well.
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Old 01-17-2019, 06:57 PM
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Originally Posted by tunnles View Post
I love this subject and there's hardly a week goes by when there not a couple of stress crack posts !
What causes this to happen ??
Its really quite simple to virtually eliminate it from happening so much OR even completely !
The manufactures need to yes better gel coats !!
Yes the gel coat used is to brittle !!
Use a more slightly flexible gel coats and problem goes away !
CHINESE small boat manufactures here ALWAYS use this MORE FLEXIBLE kinds of gel coat for there export boats sent out of the country !!
ELIMINATES REPAIRS !! Plus over time I have changed the laminating and construction methods AND MATERIALS ,using better glasses TO stiffer laminates so this combined !! , NO STRESS CRACKS EVER IN THE LAST 6 YEARS I BEEN HERE ,SO NO REPAIRS !!
SIMPLE AH !
You can lay this problem straight on the shoulders of the manufactures so it they used the noodles and thought a little and trained the laminating and gel coat staff better this problem could be history in a short time !


Ahhh yes those "master craftsmen of the orient", Jinping should be Jumping at making you his Minister or Propaganda!
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Old 01-17-2019, 07:16 PM
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Yea, Gelcoat cracking. Weak spot. Too much stress. Yea, That's right.
I see a similar thread in the future.
Time to go fishing...
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