Use and Maintain Painting Tools, Equipment, and Materials
This domain tests whether you can select, inspect, use and maintain painting tools and equipment so they perform correctly and last. Questions cover brush types and bristle materials, roller covers and nap, spray systems, surface-preparation tools, measuring devices, and the maintenance routine for each.
Core rules
- Match the tool to the coating and substrate: natural bristle for solvent-based paints, synthetic filament for waterborne; short nap for smooth surfaces, long nap for rough masonry; a cutting-in brush for edges, a sash brush for trim.
- Inspect before use: brush bristles set in the ferrule, roller frame free of play, hose and fittings leak-free, spray tip and needle matched, guards in place, cords undamaged.
- Clean immediately after use. Waterborne coatings need warm soapy water; solvent-based coatings need the thinner specified on the SDS. Work solids out of the heel with a brush comb, rinse, spin or hang bristles down.
- Store rollers on their end or on a roller rack, not standing on the nap. Store spray guns with the tip and needle removed, cleaned and lightly lubricated.
- Keep a tool log and replace worn items; a worn tip changes spray pattern and film thickness.
Worked example
A brush used in alkyd enamel was left overnight without cleaning. The bristles are stiff at the heel. Scraping with a putty knife will break filaments. The correct recovery is to soak the brush in the recommended solvent, comb from the ferrule to the tip, wash with soap and water, rinse, and dry bristles down. If the heel remains hard, the brush is a candidate for replacement, not for a delicate finish.
Traps
- Soaking wooden handles in solvent, which loosens the ferrule.
- Using a roller with the wrong nap and blaming the paint for texture.
- Mixing brands of spray tips and needles.
- Cleaning a spray gun only at the end of the week.