Thanks very much guys, apologies for not replying sooner.

Got the recessed section painted black, ummed and ahhed about trying to mask up the inlay and just left it, sprayed the black and using a hobby knife the paint scraped off the shell pretty easily.
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It then got 6 coats of clear. Looks like it will need quite a few more to fill the grain in the veneer and get a level finish, just have to let this lot dry properly first. Couple of pics
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Grant