Attaching StarBoard to gel coat and fiberglass - SailNet Community
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post #1 of 11 Old 06-16-2015 Thread Starter
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Attaching StarBoard to gel coat and fiberglass

Upgrading instruments and the old holes are far larger than the new instruments. After filling the old holes with fiberglass and drilling the new/smaller holes, I had templates made to cover the new fiberglass. What material should I use between the StarBoard, gel coat and fiberglass to made them watertight? (templates will be screwed to bulkhead)


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post #2 of 11 Old 06-17-2015
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Re: Attaching StarBoard to gel coat and fiberglass

I vote for butyl.

...and against anything silicone.
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Re: Attaching StarBoard to gel coat and fiberglass

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Originally Posted by jongleur View Post
I vote for butyl.

...and against anything silicone.
Seconded.
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Re: Attaching StarBoard to gel coat and fiberglass

Having done this just recently with my hatches and windlass the only way to get a good seal is to mechanically attach the Starboard with screws or bolts.
Any good bedding compound or butyl will work but it will not adhere the Starboard to the gelcoat.
Sand the gelcoat surface and clean the Starboard with alcohol before applying.
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Re: Attaching StarBoard to gel coat and fiberglass

I think the OP said they planned to screw them on. I'd go with good butyl. You can even test it to see how it seals.

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Re: Attaching StarBoard to gel coat and fiberglass

I would use 4000 or 4200 sealant. butyl is to thick, the starboard is flexable and will warp when the screws are tightened with a thick sealant under it.
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Re: Attaching StarBoard to gel coat and fiberglass

Sudbury's Elastomeric sticks to Starboard very well.

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Re: Attaching StarBoard to gel coat and fiberglass

I second the suggestion of Sudbury. It's the first sealant I've seen that will stick to Starboard without elaborate preparation of the surface.
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Re: Attaching StarBoard to gel coat and fiberglass

So Sudbury can be applied as a thin coating?

The screws that attach the displays will go through the Starboard into the bulkhead.
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Re: Attaching StarBoard to gel coat and fiberglass

Sudbury sealant is similar in consistency to other sealants in tubes. I'd run a good bead just inside the edge of the Starboard, screw it down, then clean up the squeeze out with paper towels and the recommended solvent. I think they suggest mineral spirits, it's on the tube. Work fast. It drys fast.
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