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Yes, you can paint oil paint over sound water based paint easily, just be sure to degloss and clean the surface prior to painting.
can i use water base paint over oil base paint
No, you can't .
Yes, you can, That's the normal way.
You just paint right over it, no special prep is necessary.
Yes, you can
Yes.
Yes, if the original is in good shape, not flaky.
well you can add water to 1 paint and then add no water to another paint then mix together. THEN YOU CAN PAINT BUT GO OVER THE PAINT A ROUGH 10 TIMES AND THEN YOU HAVE SHIMMERY PAINT.
Yes, however clear polyurethane has a yellow cast that will affect the color of the paint. Most water based clears are crystal clear, very durable and can be used in place of an oil-based clear coating.