A: the primer is quite runny, so I found that a short-nap roller on smooth surfaces worked best.
For best results, prime entire surface before painting. Apply with a high quality brush, 3/8” nap roller, or airless sprayer.
Use a nylon, polyester or synthetic roller. Do not dilute. Spray opening: 0,017 inch.. Pressure: 140 -170 bar.
Apply with a natural or synthetic (nylon, polyester or blend) bristle brush, roller, or airless sprayer. Follow manufacturer's instructions when using spray equipment. For airless spraying use a 0.011"-0.013” tip at 800 to 1200 psi. If a conventional sprayer is used, spray at 45-55 psi.
Paints and primers with glossier sheens, like enamels, are most compatible with woven roller covers that shed less lint and deliver smoother finishes. Oil- or water-based paints are best applied using knit roller covers, since they have a more “open” fabric construction to pick up and release greater amounts of paint.
Step #3: Understand Nap Thickness
⅜” - ½” (9.5-12.7mm)—For smooth and semi-smooth surfaces like drywall, painted or unpainted walls and ceilings. ¾” - 1” (19.05-25.4mm)—For semi-rough surfaces like wood, stucco or a textured ceiling. 1 ¼” - 1 ½” (31.75-38.1mm)—For rough surfaces like concrete block, brick, or masonry.
Walls, Wood, and Metal - Small 1/4″ roller covers or foam rollers will produce the smoothest finish. Light to Medium Textured Surfaces - Microfiber rollers are best. Smooth Surfaces - Use a white woven short nap roller for an ultra fine finish.
This primer is really thin and dries very smooth no matter what you use. I started using a regular 4" roller which put it on thicker, but I realized I didn't need to put it on that thick for a great result so I switched to a thin layer with the foam roller.
You only need to sand if there are brush strokes or other blemishes. Also you don't need to sand between coats.
3. Priming. Prime all areas to be decorated with one full coat of B-I-N® Primer Sealer. Allow a minimum drying time of 45 minutes in normal drying conditions.
In most cases only one coat is necessary to prime most surfaces. If excessive absorption occurs over very porous substrates a second coat may be necessary. Spot priming is recommended only under high-hiding topcoat paints. For best results prime entire surface before painting.
Many painters “break in” a roller cover by priming it with water or thinner. In our lab we never prewet a cover before painting. If you choose to, you must spin it out with five or six strong pumps so it is only lightly damp. Then take even more moisture out by blotting the cover with a paper towel.
The long nap roller has been developed for applying acrylic paints on the more porous, textured and rougher surfaces. The longer nap length ensures extremely efficient material pick up and release overcoming the most challenging substrates.
A rule of thumb to follow is that the rougher the painting surface, the thicker the nap you should use. Roller covers are typically available in thicknesses of 3/16 to 1/4-inch, 3/8 to 1/2-inch, 3/4 to 1-inch and 1 1/4 to 1 1/2-inch, each designed for a different purpose.
The drawback to using shellac-based primers is that they are not as versatile as latex or oil and they give off more fumes. They require that you use denatured alcohol to thin them and clean applicators.
Zinsser Bin Shellac based primer is the best stain blocking primer available. BIN is great for blocking stains, odors and wood knots. While it is not a bonding primer, it does have strong adhesion.
If you are working on a small project, a foam roller is fine! If you're working on a larger project I recommend a microfiber roller. In addition to preventing bleed through, BIN Shellac sticks to any surface without sanding.
Yes, The Zinsser BIN Primer can be painted over. you would have to use methylated spirits to clean the brushes. Would Zinsser B-I-N protect a laminated bathroom vanity unit from blistering due to a damp atmosphere? No, The Zinsser BIN Primer would not protect the unit from the Damp atmosphere.
Once you've completed your last coat of primer, you should go ahead and sand before applying your first coat of base color. However, there is no reason at all to sand between coats of primer. It will only add more work to your plate with no visible benefits.
Don'ts: considerations for safe and effective foam rolling
Avoid rolling over joints – rolling joints can cause inflammation of the tendons and ligaments around the articulation. Also, avoid hyperextension of unsupported joints.
B-I-N has a "perm" rating of 0.4 perms. which means it is an exceptional vapor barrier. ("Perm" is a unit measuring the permeability of a film to moisture.) Sealing walls and ceiling with B-I-N keeps moisture vapour in the house, making it more comfortable in winter.
1/2 Inch Nap vs 3/8 Inch
A 3/8 nap is sufficient if the surface has no texture or a simple roll-on texture. However, if the wall is textured with concrete or plaster, using a 1/2-inch nap or greater as necessary will ensure you apply for the proper paint coverage.
Quality 12mm nap rollers will apply an even paint film to your walls and ceilings and give you a great finish, without splattering paint all over you and the floor. Professional painters actually use 20mm nap rollers on ceilings, and 12mm nap rollers on walls.
If there is a very noticeable amount of air bubbles during application, try slowing down application speed. Follow label and data page directions for the appropriate applicator. Determine the correct roller cover type or nap based on the coating being applied and the surface to be coated.