Several Boysen products address common paint problems. One of them is Boysen Chalk Blocker which is great for chalking paint. Chalking is a paint problem that needs to be addressed if you want to repaint a concrete surface. If you don’t see other serious problems accompanying the chalking, it may be best to get a can of Chalk Blocker. Learn more about it here!

Boysen Chalk Blocker | MyBoysen

What is Boysen Chalk Blocker

Chalking is a paint problem that you’ll notice as powder on the surface of your paint. When you run a hand on the painted surface, some of the powder will rub off on you. It’s alright! See if Boysen Chalk Blocker can help.

Boysen Chalk Blocker is used to prime previously painted concrete surfaces that are experiencing chalking. It binds chalk residue to the substrate eliminating the need to completely remove all chalk residue on the wall for an easier repainting process.

What is Chalking

Chalking is somewhat inevitable—it’s actually part of the natural aging of paint.

Paint consists of essentially three things: pigment, binder, and solvent. Over time, due to exposure to ultraviolet rays (a.k.a. sunlight) and moisture, the binder which is responsible for holding everything together, breaks down.

It is this deterioration of the binder that loosens the pigment in the paint which is now rubbing off on your hand as a loose, chalky powder.

Boysen PinTanong Videoserye: How to Repaint on Chalking and Peeling Concrete Walls | MyBoysen

How to Use Boysen Chalk Blocker

Boysen Chalk Blocker can be used on concrete surfaces to treat chalking of water-based and solvent-based paint.

To use it, first, sand the surface to remove as much loose powder as possible then clean the surface using a damp rag. Don’t worry if you don’t get all the chalking out and some get left behind. Once the surface is dry, apply a generous coat of Boysen Chalk Blocker.

Allow 24 hours of drying time to ensure that the product is able to fully treat the surface. Then, apply your topcoat. Recommended topcoats include Boysen Permacoat Latex, Boyesn Acrytex, and Boysen Wallguard.

Surface preparation before using Boysen Chalk Blocker | MyBoysen

When to Use Boysen Chalk Blocker

With old paint, you are very likely to see chalking especially if it’s regularly exposed to sunlight and moisture. Use Boysen Chalk Blocker on aging paint with no other issues.

If you’re seeing severe chalking or chalking accompanied by other paint problems, it’s likely your wall cannot be remedied easily or with Boysen Chalk Blocker alone. It could be that the product itself is not suited for the surface or area where it was applied, so even with Boysen Chalk Blocker, the paint will continue to deteriorate.

In situations where repainting cannot solve the issue, scraping off the paint and starting again with a bare substrate is usually the course of action. If you’re unsure of what to do or what type of paint product is best for your project, it’s best to first consult with a professional painter or contractor.

Got Paint Problems?

Head to the Common Paint Problems section of this blog to learn more about chalking, blistering, mold and mildew, and more. If you’re still lost, consult with an engineer from the Boysen Technical Service Department. Send an email to or call (02) 8363-9738 local 413 to 418 during office hours.


Jill is a writer on a continuous journey to learn about paint and share them with you, the reader. She has an interest in the technical side of things but also thoroughly enjoys playing with colors. She likes calm greens, quiet blues, and mellow yellows best.

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