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Author Topic:   1968 Sport Hull Repair

penbay01 posted 07-14-2009 11:46 AM ET (US)
I recently picked up an old whaler hull that I'm preparing to re-gelcoat. However, there is a moderate ammount of damage to the bottom of the hull along the chine from the boat just coming on and off of a trailer. The existing gelcoat has been worn away, and you can see a few exposed fibers sticking out here and there.
What is the best way to prep this? Can i just sand it lightly and then brush on a think coat of plain resin? Or can I even just gel coat right over it?
A picture.
jimh posted 07-15-2009 08:03 AM ET (US)
Gel coat resin is typically only applied to a thickness of about 0.020-inch. If gel coat resin is built up to greater thickness it will be too brittle and will be prone to cracking.
You can make repairs to a Boston Whaler hull using polyester resin or epoxy resin. You may find that three articles on the general topic of making repairs to Boston Whaler hulls will be of interest to you; I recommend:
The Epoxy Cure
http://continuouswave.com/maintenance-logs/epoxy/
Repairing Hull Damage the Whaler Way
by Taylor Clark
http://continuouswave.com/whaler/reference/whalerRepair.html
INSTRUCTIONS -- HULL PATCH KITS
http://continuouswave.com/whaler/reference/repairInstructions.html
If you plan to reapply anti-fouling paint to the hull bottom, I would not bother with a gel coat layer to finish the bottom repairs. Either polyester resin or epoxy resin can be used to make the repair. Since the surface will be covered with anti-fouling paint, there is no point in building up a gel coat layer to a high gloss and smooth finish.
penbay01 posted 07-15-2009 04:14 PM ET (US)
Thanks for cleaning up my posts.
Okay, so I'm thinking i can just sand down the roughness in the existing glass, and then coat that with a layer of epoxy to serve as sort of a barrier, and then gelcoat? I was hoping not to have to apply any new mat, as was done in the first article, and there is no damage that goes through to the foam.
The shape of the chine is still generally very good it is just, for lack of a better term, worn, so all i really want to do is make sure that I have protected the existing glass from water penetration and then gel coat over it. Is this the best way to go about this sort of bottom repair?

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Author	Topic: 1968 Sport Hull Repair
penbay01	posted 07-14-2009 11:46 AM ET (US) I recently picked up an old whaler hull that I'm preparing to re-gelcoat. However, there is a moderate ammount of damage to the bottom of the hull along the chine from the boat just coming on and off of a trailer. The existing gelcoat has been worn away, and you can see a few exposed fibers sticking out here and there. What is the best way to prep this? Can i just sand it lightly and then brush on a think coat of plain resin? Or can I even just gel coat right over it? A picture.
jimh	posted 07-15-2009 08:03 AM ET (US) Gel coat resin is typically only applied to a thickness of about 0.020-inch. If gel coat resin is built up to greater thickness it will be too brittle and will be prone to cracking. You can make repairs to a Boston Whaler hull using polyester resin or epoxy resin. You may find that three articles on the general topic of making repairs to Boston Whaler hulls will be of interest to you; I recommend: The Epoxy Cure http://continuouswave.com/maintenance-logs/epoxy/ Repairing Hull Damage the Whaler Way by Taylor Clark http://continuouswave.com/whaler/reference/whalerRepair.html INSTRUCTIONS -- HULL PATCH KITS http://continuouswave.com/whaler/reference/repairInstructions.html If you plan to reapply anti-fouling paint to the hull bottom, I would not bother with a gel coat layer to finish the bottom repairs. Either polyester resin or epoxy resin can be used to make the repair. Since the surface will be covered with anti-fouling paint, there is no point in building up a gel coat layer to a high gloss and smooth finish.
penbay01	posted 07-15-2009 04:14 PM ET (US) Thanks for cleaning up my posts. Okay, so I'm thinking i can just sand down the roughness in the existing glass, and then coat that with a layer of epoxy to serve as sort of a barrier, and then gelcoat? I was hoping not to have to apply any new mat, as was done in the first article, and there is no damage that goes through to the foam. The shape of the chine is still generally very good it is just, for lack of a better term, worn, so all i really want to do is make sure that I have protected the existing glass from water penetration and then gel coat over it. Is this the best way to go about this sort of bottom repair?