Before painting over semi-gloss paint, be sure to lightly sand the entire surface and apply a primer so that the new paint will adhere properly. Paint over shiny surfaces with helpful tips from a professional artist in this free video on painting techniques.
How to paint over semi-gloss. If you have semi-gloss you know that it's a very shiny surface somewhere in your house. I don't really have any in this house but let's pretend this trim is semi-gloss. It's very shiny. First thing I want to do is determine whether it's an oil based product on there or a water base. I will take my sanding paper. My prediction since it's built in the 70's, it's an oil base. And also that I've done a lot of work in this house and it's always oil base. What happens with the oil base is when you sand it dust falls off onto your hand and onto the floor. If this was a water based product you would end up with some latex goop on your sand paper and it wouldn't sand the same way. It would leave marks, not smooth it out. That's the first thing to determine. Then in order to paint over it you are going to prime it, lightly sand it and prime it. Or use something called a deglosser that you can buy in your hardware store and just follow the directions on the back of the jar to minimize the glossiness of the surface. What you want to do is make sure that whatever you're going to put on there sticks, because it is slick. So preparation, degloss, sand and prime is always usually the best thing to do. Using a water based primer if you want to go back to water base. And put it on the whole semi-gloss surface and then go on and do whatever it is you want to do.
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