Frequently Asked Fiberglass and Gelcoat Questions
Common questions on marine fiberglass and gelcoat repair. Feel free to use this
form to suggest questions that you feel should be covered here.
How can I get rid of the chalky
substance on the gelcoat?
What should I do about stress cracks?
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How can I get rid of the chalky substance on the gelcoat?
If it's not too bad, you can usually get away with just buffing it. It can be done by hand, but that would take a
long time--using a power buffer is the way to go. If the oxidization is really bad, you can wet-sand before buffing.
Keep a steady flow of water flowing over the area you're sanding. When the water stays clear, instead of turning
cloudy, you've removed the oxidization. I'd recommend using #400 and finer wet-or-dry paper, finishing up with
at least 600-1000 grit before buffing. Whether sanding or buffing, be very careful not to go through the gel. Be
especially careful near corners, sharp edges, and pinstriping. Once you get the shine back, apply a quality marine
wax on a regular basis... and you shouldn't have to buff it out again.
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What should I do about stress cracks?
Accept them as a part of life. ;-) In most cases, they are harmless. And if you repair them, they come right
back. This is assuming that they are the result of normal stress and flex and not stress generated from crashing
into docks, other boats, or the back of your truck when you miss the trailer. Seriously though, if they bother
you, go ahead and have them repaired--just don't be surprised if they come back.
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Disclaimer: Use this information at your own risk. Seiler Marine is not responsible for
the mechanical ability of others. Never attempt a repair without the proper tools and service manual.
When it doubt... take it to a shop.
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