Re: 1973 SRV 220 OV Resto
Epoxy or poly resin?
To your earlier Q @outdrive keyhole, there is a template floating around here somewhere, for the Mercruiser keyhole. Guessing that the current keyhole is located correctly & centered, some are not, & depending on how you plan to cut the keyhole, you can set the transom in place, and follow the current hole to mark the cutout. Pull the plywood & cut the keyhole. You'll probably want some sort of a hole to aid in clamping it together when you bed the ply anyway.
Drill the bolt holes & chamfer the relief after it's installed.... Square the bolt holes to the angle of the transom.
If you're using poly resin, the 1st coat is only to aid in adhesion of the glass & poly to the bare wood and prevent 1 or the other from wicking the resin away & starving the plywood or csm of resin. The 2nd coat should be applied & used to wet out the csm JUST as the 1st coat starts to tack off, not after its dry. Depending on when Tues, the poly may still be tacky, but on bare wood, even in cool temps, but I wouldn't think 24hrs, since it's supposed to be warmer after noon Tues...
Rough & scuff will aid the adhesion if it does dry. But wet on wet is always a better bond, chemical & mechanical.
But if epoxy, yeah, tomorrow...
