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  1. #1
    Join Date
    Apr 2008
    Posts
    17

    Default Paint not sticking over "DensShield"

    I am having a problem with paint not sticking.

    I have a ceramic tiled tub surround with DensShield as the tile backer board. The backer board was extended beyond the area covered by tile abutting (perpendicular to) an aluminum window frame. This left an approx. 3" strip between the finished side of the exterior wall of the house and the start of the tile, which was painted. Within this strip the paint would “bubble” when the shower was used. Two days ago, I sc****d off the old paint, coated a rusted screw head with Jasco Prep & Prime and filled a 3/16” deep by 1” diameter area around the screw head with Dap Presto Patch. Yesterday I sanded the Presto Patch and primed with Zinnser Bull’s Eye 1-2-3 primer. After about 6 hours, as I was applying all-purpose joint compound to a nearby (higher) area of wall, some splashed onto the primer coated area. As I cleaned up the splashed joint compound, the primer under the splash peeled right off. I am concerned that simply repainting will not be enough to avoid the same problem in the future.

    Was this a matter of simply not letting the primer dry long enough or is there a sealer that I need to apply prior to the primer? (e.g. Can shellac be painted over?)

    Here is what Georgia/Pacific (DensShield manufacturer) says about painting over the backer board:

    Q:
    Can I paint DensShield® tile backer outside the shower area in a typical residential bathroom wall installation?

    A:
    Yes, the steps to accomplish this are quite simple. First, finish the joints using fiberglass mesh tape and setting type joint compound. Next, skim the entire DensShield panel surface with setting compound. Once this material dries out, prime and paint, or prime and paper. The use of setting type joint compounds are preferred over ready mix joint compounds near moist areas.

    I’d like to find an alternative (and just as good) way to solve this problem. Although I have not checked yet, I’m guessing that the minimal amount of setting type joint compound I can buy nearby will be much more than needed for this small area.

    The total “problem” area is less than 1 SF.

    Any information/suggestions/solution you can provide will be much appreciated.

  2. #2
    Join Date
    Apr 2008
    Posts
    17

    Default Re: Paint not sticking over "DensShield"

    Thank you for your post 080522jk. However, for some reason your post is mostly interpreted as a small block for each character. Is your post in a language other than English?

  3. #3
    Join Date
    Aug 2007
    Posts
    6,480

    Default Re: Paint not sticking over "DensShield"

    Quote Originally Posted by warriorfox View Post
    Thank you for your post 080522jk. However, for some reason your post is mostly interpreted as a small block for each character. Is your post in a language other than English?
    Otherwise know as a spammer. He's hitting every thread on the site. Use the "exclamation point" icon in the upper right corner of his post to report him.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  4. #4
    Join Date
    Apr 2008
    Posts
    17

    Default Re: Paint not sticking over "DensShield"

    A. Spruce ... Duh! How did I not pick up on that? Thx for the response.

  5. #5
    Join Date
    Apr 2008
    Posts
    17

    Default Re: Paint not sticking over "DensShield"

    Yuk-Yuk ... Thx for your response. I've gone ahead and done the best I could. Time will tell if it was good enough

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