Can acrylic paint be used over oil base on a deck?

No, acrylic paint should not be used over an oil-based paint on a deck without proper preparation. Oil-based paints can create a barrier that prevents acrylics from adhering properly, leading to peeling and chipping. If you want to use acrylic paint, it's essential to strip the existing oil-based paint or thoroughly sand the surface and apply a suitable primer designed for compatibility. Always follow manufacturer guidelines for the best results.