We revealed to you the key to a good painting job by giving you the basics of surface preparation for new concrete. But how about previously coated concrete surfaces that need repainting? No worries, we got you covered! We will present a step-by-step guide to preparing concrete surfaces for repainting. 

First things first, it’s a MUST to observe the condition of your old painted walls. Each coated concrete surface can have an existing problem that needs to be treated first before repainting. Here, we break down for you painted concrete wall issues and expert-approved tips on treating them. 

How to Deal with Peeling Paint

If the paint film does not adhere to your concrete anymore, then it’s best to scrape off all the loose, scaling, peeling, or flaking paint. Then, clean the surface to fully remove dust, dirt, or grease. 

Common Painting Problems: What is Peeling?

Check out this article to see if your walls have peeling paint.

How to Prep Chalky Surfaces

Sometimes, old paints on concrete can be chalky. When the surface is chalky, powder comes off and sticks to your hand once you touch it. In this case, apply Boysen Chalk Blocker B-7304, using a brush or roller, which will serve as your primer.  Wait two hours for it to dry before applying the topcoat.  

Take note that if the chalking is severe, experts recommend that you fully scrape off the paint.

How to Treat Mildew-Infested Walls

Common Painting Problems: What is Mildew?

Your walls can have mold or mildew or those unsightly patches. If you notice mildew infestation you can apply a bleach solution (one part laundry bleach to three parts water) to the surface using a clean rug or a brush. Let it stand for 24 hours before washing it off. Let it dry completely before painting. 

Check out this article to see if your walls have mildew. 

Once you’ve treated, cleaned, and dried off the surfaces, follow the recommended system of painting. Firstly, apply the primer on bare surfaces. Then, cover hairline cracks and minor surface imperfections with putty. Finally, apply the topcoat. 

If you want to know more about how to prepare other wall surfaces, watch Boysen Painting 101.

For more painting tips, click here. If you have any questions, you can contact us at ask@myboysen.com. 

Yasmin Aguila

Yasmin is a copywriter who writes poems when she is in love. She is also a feminist and a film enthusiast.


  1. Avatar
    Carl jeson p.opena Reply

    Gud am po bkit po ngkaron Ng lobo\bubbles Yung posted n pininturahan k eh 2weeks npo sya nkapahid tas 3days p nguulan eh tnatamaan psya Ng tubig nglobo po Anu po Kya Ang remedyo don eh smantalang elastomeric po gnamit ko sun and rain…Ptulong nmn po kng anu remedyo don…

      • Annie H Adlawan

        Hi Carl, Nag bounce back iyong email to you from our Technical Team. Eto iyong sagot:

        “Salamat sa iyong comment at sa pagtangkilik sa Let it B.

        Base sa iyong description, mukhang may water seepage ang iyong pader.
        Para masolusyunan ang pagkatas ng tubig, mainam na hanapin muna ang source ng tubig. Maaaring mga cracks sa exterior walls, sirang linya ng tubo, mga butas, at/o iba pa. Kailangang ayusin muna ito, bago mag-repainting. Magpapabalik-balik lang ang problema kung hindi muna ito magagawa.

        Advisable rin na kumonsulta sa mga professionals tulad ng waterproofing experts o contractor para sigurado ang pag-aayos ng iyong problema.”

        Pag meron ka pang tanong, please send an email to ask@myboysen.com o kaya tumawag sa (02) 363-9738 local 417 to 418 during office hours.

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