Tried with the Polyester resin again. This time I made sure that the fingerboard was free of any oils or sweat, checked and double checked the mixing ratio of resin and catalyst, poured a thinner layer, but a fortunately the same result.
After about 40 minutes the bubbles began to appear from the wood again, although the top was hard as nails it had not cured against the FB, and was delaminating like the first try.
Hopefully I've taken operator error out of the equation, so that leaves a) some sort of reaction to the rosewood, b) I'm still trying to pour too thick a layer of resin or c) a dud batch of resin. I could try "painting" on several thin coats but to be honest I think I am done with polyester resin.
I can see 2 options, sand back what's left of the dodgy resin and just go with a naked wood fingerboard or try EPOXY resin!
Having already established that I am pretty stupid and a masochist to boot, no prize for guessing which way I am going.
There is a local boat chandlers near me so I will go down there later today and sus out their epoxy.
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