| Another important thing to remember about primers that are applied to plastic surfaces, is that they form an efficent mask between the volatile final coat of paint,we discussed here a few days ago about the change over to acrylic formulae paints by the auto industry,whilst the final paint finishes are fine on metal sometimes the solvents can still possibly attack raw plastic,with this in mind a barrier of primer is a wise thing to apply,besides as Richard has pointed out being a useful guide as to the blemishes that need to be removed,primers certainly show the humps and bumps !
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