painting problem


Old 01-09-12, 03:42 PM
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painting problem

I painted some inside trim (with acrylic latex eggshell paint) that was already painted white. 2 days later I was wiping something on the floor near the trim with a wet sponge and the trim paint came off. I did not sand or prime to prep the surfaces just washed with mild soapy water and wiped clean. Did I use the wrong kind of paint? What should I do for prep and paint?

2nd problem. I have a window sill that I am pretty sure is a stained varnish. I sanded this to a matt finish. Can I just paint and if so what kind of paint should I use?
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Old 01-10-12, 04:16 AM
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I suspect you painted over an oil base enamel. Latex paint won't adhere well to oil enamel. You need to either stick with oil base enamel or sand and coat the oil enamel with a solvent based primer. Latex will adhere to oil base primer. The same is true of oil base varnish/poly.

To fix what you've already painted with latex, I'd sand it aggressively with 60-80 grit sandpaper. That will remove the majority of the latex that hasn't adhered well, then oil prime, sand with 120 or 150 grit, then your latex enamel will adhere.
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