background preloader

Paints and Coatings Common Substrates

29 december 2021

Paints and Coatings Common Substrates

To produce a quality, long-lasting job, painters dealing with a variety of Paint Substrate throughout facilities should approach application tasks with a combination of preparation, application, and cleanup. The following are some of the factors to consider for a variety of common substrates:

Drywall

Workers must use a nail set and hammer to set nail pops below the surface, or a screwdriver in the case of screws, then spackle over them to cover the hole and sand them smooth. Workers must replace the damaged section after treating the primary cause, such as water damage or insufficient fasteners.

To eliminate mold and prevent its recurrence, a mold-killing fog bomb may be required. Workers must tape joints and treat them with numerous layers of joint compound before sanding them smooth. Workers must remove a layer of dust left by repair work to paint on a dust-free, smooth, and dry surface.

Wood

Workers must sand wood trim, door and window frames, and floors after filling gouges and cracks with plastic wood filler or putty according to manufacturer recommendations. With a power sander, they can remove floor stains and old varnish. If the old surface is gloss or semi-gloss paint or varnish, the gloss must be removed with sandpaper.

Deep stains may need to be treated with oxalic acid to remove them and reveal the original grain. To remove debris and sanding dust, wipe the surface with a cloth saturated in paint thinner. Then wait for it to dry. Workers should apply an abrasion-resistant varnish or a long-lasting polyurethane finish to wood floors.

Ready to paint or intact mill scale; rusted mill scale; 100 percent rusted with no pits; rusted and pitted with the paint mostly intact; zinc-rich paint; and degraded paint over mill scale are some of the metal steel substrate classifications.

The paint will adhere properly if the surface is oil-free, dry, clean, and tight after preparation. Painters must remove loose scale and rust from complete mill scale and partially rusted mill scale utilizing a wire brush, chipping hammer, and grinder combination. After that, they must wipe the area with paint thinner to eliminate any remaining oil before applying the primer to the clean, dry surface.

A rusted mill scale surface will require more effort, but the procedure remains the same. To give a good substrate for the topcoat, the primer's binders cling closely to the clean surface. With only the primer to protect them, I-beams, H-columns, flats, angle iron, and channel iron can be stored outside for a long period.

Masonry

Before applying a coating, new masonry must cure for 30 days. All masonry is porous and susceptible to mold and moisture. Coatings for the outside floor, walls, stucco, driveways and interior subsurface floors and walls are available to managers.

Workers can use a pressure washer to remove dirt, dust, mold, loose or cracked coatings, mildew, and stains from the surface. Masonry paints contain fillers that will fill bare, porous masonry, such as cement blocks. After cleaning, apply a surface-matching coating, such as acrylic latex for stucco, for a long-lasting, weather-proof finish. You can also request mold- and mildew-resistant coatings as well as antimicrobial coatings.

These are some of the substrate paint surfaces on which you can apply the coatings.