What To Know Before Painting Without Sanding
It is definitely ok to skip the sanding step in some cases before you paint a piece of furniture. However, before you skip the sanding step, here are a few things to know.
1. Is the Surface Shiny? Slick?
If the surface is very smooth and shiny, I would hesitate before skipping the sanding step. You may end up with paint or even primer that just peels off or is easily scraped off with a fingernail. I would at least go over it with 220 or 320 grit sandpaper, enough to just give the primer or paint something to adhere too. A really slick or smooth surface can be hard for primer to stick to.
2. Is the Surface Thoroughly Cleaned?
Make sure you start by cleaning the surface with some kind of degreaser before you paint or prime. Paint and primer will not adhere to any type of oils, even those used in cleaning. So, you must clean with a degreaser first to make sure you are down to the top coat before you start painting.
3. Has the Surface Been Waxed?
If you are painting over something that has previously been painted and has a wax coating over top, you will have to sand this wax off. Paint and primer will NOT adhere to a wax surface. You’ll be sorry if you don’t!
4. You Can Use a Liquid Sander
You can also wipe the piece down with a liquid sander (available at most hardware stores) instead of using sandpaper. Just read the directions on the back before buying and make sure it will work with your piece and the primer and paint you intend to use.
5. Use an Oil Based Primer
If you decide not to sand, then I would definitely use an oil based primer or a shellac based primer as opposed to no primer or a water based primer. Oil and shellac primers cure faster, reducing the risk of paint peeling or being scratched off within the first 2-4 weeks.