When glassing a bulkhead to the hull, the plywood bulkhead can’t actually touch the grp hull, or it can create a weak point. So i have been reading anyway. You only need a tiny gap, just enough to allow things to flex a little.
I was searching for something to pad the bulkheads while i glass it in place and came up with this idea. I’ve cut some not slip mate into strips and supeglued it at regular intervals along the bulkhead. It worked well for the smaller one’s, but i’m not sure if the weight of this next one will compress them a bit too much. We shall see.
You can also use small wedges to position the under size bulkhead and glass in with short strips of mat. Once the tabs have cured, remove the wedges and finish bonding in.
Seal the plywood edges as well.