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oomfh 06-16-2015 10:37 PM

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)

http://im1.shutterfly.com/media/47a5...D720/ry%3D480/

jongleur 06-17-2015 02:25 AM

Re: Attaching StarBoard to gel coat and fiberglass
 
I vote for butyl.

...and against anything silicone.

IStream 06-17-2015 10:10 AM

Re: Attaching StarBoard to gel coat and fiberglass
 
Quote:

Originally Posted by jongleur (Post 2855529)
I vote for butyl.

...and against anything silicone.

Seconded.

Dog Ship 06-17-2015 05:03 PM

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.

arf145 06-18-2015 12:35 AM

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.

overbored 06-18-2015 12:46 AM

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.

mitiempo 06-18-2015 01:41 AM

Re: Attaching StarBoard to gel coat and fiberglass
 
Sudbury's Elastomeric sticks to Starboard very well.

hopcar 06-18-2015 06:04 AM

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.

oomfh 06-18-2015 10:40 PM

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.

hopcar 06-18-2015 11:37 PM

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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