I know paint technology is a complex science but I usually get away
with it. However, I've been tarting up a pair of old Wharfdale
speakers with spray paint to match the existing grey and black kit and
the finish coat is causing the underlying primer to bubble up on a
small test area.

The primer is "Plasti-kote, Projekt Paint, Primer SUPER" which I
bought from B&Q. I have also bought some Simoniz Acrylic Black as a
top coat. Neither cans give specific details about their chemical
composition but they sure enough don't like each other.

I'm hoping someone can tell me of an intermediate neutral coat I can
apply to avoid having to strip the whole lot back to stage 1.

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Kind regards,
Geoff Mills