In message
Geoff Mills wrote:

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

Sometimes just using a different *solvent* can cause a reaction
problem when using different paints, even using the same solvent
at a later date can cause a reaction problem, especially with
cellulose and acrylic spray based paints.

I'm not referring to trapped solvent bubbles here, they are a
different problem altogether.

As previously suggested, leave the primer to dry sufficiently
before attempting to apply a top coat and when you do, apply a dry
coat first which will help protect the surface from over wetting,
which is the main cause of solvent reaction as the solvent
penetrates the surface underneath.

Stephen.



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http://www.stephen.hull.btinternet.co.uk
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