Sanding Painted Wood
For some types of paint only cleansing the surface is good enough.
Sanding painted wood. This is true especially when you are working on wood. Especially if you are using a primer first and a top coat or sealant wasn. Then switch to fine sandpaper 200 grit until the entire piece is uniform.
Rub the sandpaper over the wood. So the paint gets into direct contact with the surface without getting a dust layer in between. Always pre-soak the sandpaper ensure the area is wet and work evenly across the surface.
When You May Not Need to Sand Wood. Sanding can be a tedious process but it is vital to the overall quality of the woodworking project. You can then sand the entire surface to give it a more textured surface that your paint will easily stick to.
If you need to sand away paint globs then use a coarser grit paper like an 80 grit Once that shiny top layer of paint is gone wipe away your dust. Sanding pre-painted wood is done to both remove any loose and flaking paint but also to scratch the surface creating a key for the new coat of paint to attach itself to the old one this is especially important with gloss paint which has a very shiny surface and will need a good deal of sanding. Attach 40- to 60-grit sandpaper to a sanding block or palm sander to remove paint.
Sanded particles are removed completely using a lint-free cloth soaked with paint thinner as the humidity of the cloth will pick up. Either way start with 80 grit sandpaper and progress to 100 grit and then 120 grit. For example with painting if a wood surface has already been painted or stained and is smooth and clean you could paint over it without sanding.
But if you want the best result then you should definitely sand the wood before painting. Wood tends to have some lumps and bumps and that is why making the surface smooth will guarantee that you will have great results after painting. This is also a good time to scrape any old flaking paint off and to sand down old paint lines.