Reply by bilyo

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Posted on Cabinet door/face frame questions - sanding and material

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1363 posts in 2181 days

#1 posted 03-03-2021 04:50 PM

Also, since this is S4S poplar, and I m priming and painting, I m also assuming I don t need to go through all the grades of sandpaper and don t need to wet between grades to raise the grain. Is that a poor assumption?

- KvG

While sanding surfaces that will be primed and painted is less critical than for clear finishes, you still need to do adequate sanding to remove any milling defects such as the slight “scalloping” you see from commercial planers. And, progressing through the grits actually makes your sanding easier because removing the scratches left by one grit is easier and quicker if you use the next finer grit rather than skipping grits.

Wetting the surface to raise the grain and then sanding is usually reserved for the last pass prior to applying stain or the first coat of finish. I don’t think that there is any advantage to doing this between grits. Since you will be priming the surface before painting, I think you can skip this step. The BIN primer will “freeze” the wood fibers and they will be “cut off” smooth as you sand the primer. I have always gotten great results sanding the BIN lightly with 220 grit prior to paint.

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