Drywall Sanding Tips for Finishing & Repair - Wet & Dry
Dry Sanding ApplicationsScreens versus Paper Sheets
Sanding paper comes in brown garnet paper, black silicon carbide paper, which outperforms the former, and screens of black siliocon that are precut and packaged to fit onto hand and pole sanders. The papers do clog with the gypsum powder quicker than the screens, which are designed to shed the gypsum. The screens do hold up to greater movement with less wear.
The prepackaged sheets sometimes have to be trimmed at the sides to prevent inadvertant, line-scratching the dried compound on the wall due to the corner folds of the paper.
If using anything less than 120 fine grit do not press overly hard or the surface will scratch. The 100 grit should be able to abrade the compound, and some sanders will go to medium 80 grit. But the point is, the coarser the grit, the more obvious trackings become.
For breaks, angles and tight areas, the beveled sanding sponge is ideal. Greater motion is preferred over increased pressure. This will distribute the reduction of surface area.
For small to large patch areas the hand sander does nicely. The wood and metal designs are less likely to flex under pressure than the plastic models.
Pole sanders take somewhat more vigorous activity and these are designed to carry the leveling over broader areas. Careful with the rectangular heads - these easily flip with a change in direction and this can scar the wall and stop progress. Newer versions of the sanding pole have round, larger padded heads with smartly replaceable sheets. They are better for curving walls and allow quick sheet change out.
Often hailed as 'dustless sanding' the vacuum rigs do bring in the particles. They operate on round head surfaces. Therefore angles will need to be hand sanded. Typical prices are a couple hundred to $1200 to $1500.
Wet Sanding TechniquesMethods include a damp or soaked sponge or rag. Wet sanding is fundamental to truely dustless sanding or to match contours or textures. Wrap a wet or damp rag around a taping knife to make it level.
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