My transom is 1 1/4 inches thick. Since they don't make marine plywood that thick, I can double up 2 5/8 sheets to get the proper thickness. How do I glue them together? 3m 5200?
I agree that liquid nails works well. There are several different grades of it. Make sure you use a grade that is for moisture. They usually have something like "suitable for bathroom floors" or "marine grade" on the tubes. Also use a grooved trowel like you would use on flooring to spead it evenly across the sheets before putting them together. Spreading it out like that in a thin coat will serve you better than just squirting a few lines of adhesive on it with a caulking gun. Clamp them together for the recommended time and saw for fit afterwards rather then before.
Good Luck!
Oh! forgot to mention....5/8" plywood is not always a full 5/8" thick!
I would use epoxy resin & sandwich it, then use a heavy grade of cloth & resin it also. I would also over size the engine mount bolt holes & complely impregnate shredded cloth fiber so when you drill the actual holes there is no wood exposed, all epoxy resin, no rot again. Just my 2 cents!!!
Give PT plywood a serious consideration.I'm not sure about compatibility
with aluminum with new formulas.You should be able to get info from suppliers
or manufacturers.It needs to be allowed to dry before any project.It will glue and paint.My PT ply transom is about 25 years old Still going strong no paint ,no sealer.First 20 years it spent April to December in the water in northern NY and outside year around.If sealed marine ply is comprimised
it is sure death of the wood.
I'd use the epoxy resin, slow curing hardener and a thickening agent applying the stuff with an 1/8th inch toothed trowel covering the entirety of one surface. If possible try and vacuum bag the assembly after its been glued. If you want to do it cheaply you could try any one of the new polyurethane wood glues out there like Gorilla glue and then just clamp the pieces together.
