Can I paint semi gloss acrylic over the same without sanding? It was lasted painted approximately three years ago.
By Wendy S from Australia
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The reason the last paint job lasted so long is that the surface was properly prepared-the surface was roughed enough that the new paint adhered. If the current surface isn't roughed in some way, the new paint will not adhere and you'll have a nasty peeling mess to show for your hard work.
You can probably rough the current surface easily, though, with a TSP wash. I'm not sure if that product is available in Australia, it's a cleaner, comes as a premixed spray or bottle (pricey, wowsa), powder, or concentrate.
Or you can try a homemade mix of vinegar and water (1-1 parts ratio). Test a small inconspicuous area to be sure this will rough your surface sufficiently to permit the new paint to adhere to the old.
Using a wash often opens the current paint surface enough to permit new paint adhesion, and eliminates the need to sand.
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