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Which caulk for cracks around skirting and coving

Discussion in 'Decorating and Painting' started by GmGookieMonster, 14 May 2021.

  1. GmGookieMonster


    9 Mar 2021
    Thanks Received:
    United Kingdom
    I usually use no nonsense but i always seem to get cracks appear around plaster coving after time.

    Is this just a typical thing with caulk

    Would a glue or paintable silicone like ct1 be a better option
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  3. opps


    16 Jun 2006
    Thanks Received:
    United Kingdom
    Normally, the cracks are not cracks in the caulk but cracks in the paint.

    The problem varies with different brands of paint and different caulks.

    I normally use Everbuild 125 caulk and Dulux Trade paints. That combo doesn't crack. A couple of weeks ago I used a green Johnstones trade emulsion with the 125. It didn't crack but after a few days the paint over the caulk became darker. I resorted to hitting the caulk with Blockaide shellac paint and repainted them.

    When presented with previously painted rooms that have cracked caulk, I just apply shellac paint and then repaint them. Oil based undercoat should work as well but takes much longer to cure and if you are using a "poor" quality paint like Farrow and Ball, you may end up with fisheyes.

    CT1 and the other MS polymers are great but are better suited to areas subject to movement. They have the advantage of not shrinking back but they are messier to work with and (potentially) leave a thicker edge. They also need to be treated with water based paints if you plan to use oil based finish coats on the skirting. If you don't the oil based paint will take months to dry. It is also 10 times more expensive than the 125.

    A few years ago, a customer asked me to seal gaps where the skirting meets the wooden floor. I used CT1. 18 month later, I painted the whole room, I had forgotten about the CT1 and used oil based eggshell on the woodwork. I soon remembered when a few days later, I was cleaning up and discovered that the paint on the CT1 was still wet.
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