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I think there's more fiberglass suppliers in Florida then any other state.
Mainly uv cured additive to silmar resin for surfboards makes it dry quicker so they can flip the board over and keep working, Using uv additive...
Good place to buy fiberglass products To find quality fiberglass at a great price do no go to bw or WM, buy from a fiberglass store....
What about using Celtek pvc board. It is lighter then plywood and you can screw to it, glass sticks very well.
https://fiberglasssupplydepot.com/fiberglass_safety.html
Link to application guide from Awlgrip https://fiberglasssupplydepot.com/AWLGRIP-TOPCOAT.html
Duratec Mis info You can not spray gelcoat with duratec additive without sanding and buffing after, you need to sand the surface lightly and buff...
Buy AT Prime at Fiberglass Supply Depot Here is a direct link to ATPRIME fiberglasssupplydepot.com/ATPRIME-2-SECONDARY-BONDING-AGENT.html
Any wood glassed over should be coated first and let cure, If glassing directly over plywood without coating first not only will you get out...
Why not use a pvc core like cel tek, you'll never have rot again and you can mount whatever needs to be mounted to top.
Vacuum bagging it could get all the air out.
Do not use pressure treated wood ever in a boat if you are going to glass over plywood.
Very good cores but you must glass both sides. Nida core and plascore are two of the most popular honeycomb foam cores.
It is probably cloth and epoxy built, the core could be plascore or nida core. Please add pictures so we can help.
That tip size should work fine for spraying gelcoat, just make sure you have acetone ready if it starts getting too hot in your gun, the gelcoat...
To me this seems like the plug and not the mold, could be top cap with shinny inside finished part when pulled off, then where is the hull mold...
Transom repair What size is the boat? a transom job on an average 20 to 25 footer will run you around 2000$ I have seen prices in Florida...
Are you going to be making the top and bottom? Looks like you will need 2 molds, then glass the finished parts together. I used to build kayaks...
Never use resin by itself without fiberglass, its like using concrete without the rebar.