Total noob question:
Sometimes when i sand ply, and go to wipe off the excess dust my rags catch on the wood and leave little fibers hooked in there. I found a great way to remove them is with steel wool, but why? Why does that happen? I use an disc sander and sand to 220, then i hand sand one more time.
any comments appreciated.
Plywood has a very thin veneer.
The softwood veneer material is subject to the wood fibers easily separating and splintering.
Hand sand ---DO NOT USE a power sander.
Power-sanders are more aggressive.
( "light-weight" palm-sanders are on the market, that are suitable for light sanding).
Use 220 grit---with light hand-pressure--- perhaps only the weight of the hand-sanding block.
For large areas, cut a full-size sheet of sand paper in half---
fold it over 2x4 block material---sand with light hand- pressure.
Sanding blocks can be shop-made from 1x stock, or thinner.
Sandpaper wrapped over a sponge will also suffice.
Applying a sanding sealer will reduce the potential of splitting and slivers.