Ok. That makes a lot more sense to me. Thanks.handy wrote: ↑Mon Nov 05, 2018 1:15 pmthat resin will work fine, perfect would be a slightly foaming resin. The plywood is only to keep the bottom nicely leveled. just tape the area where you don't want to have any resin, and put some plastic between the board and the plywood. resin that comes out of the cracks and the paint is no problem as you have to sand down the whole area before reglasing it anyway.
I am currently thinking of buying some level wood for the bottom and maybe something softer (hard styrofoam?) for the top and then clamp those two together to apply pressure (after filling the cracks with resin) from top and bottom. Would that work?