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Thread: Topcoat colours

  1. #1
    Junior Member
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    Question Topcoat colours

    I am repairing a boat which is a pale cream colour.
    I am doing structural work with polyester resin and glass mat.
    To finish I want to use Topcoat. I have a pot of white topcoat, and I can get a good colour match with a squirt of cream pigment.
    Will adding approx 5percent pigment to Topcoat which is already pigmented have a bad result? What can I get away with? No great stre nth is required, but the good bond to the new resin is obviously vital.

    Hope you can help!

    Sailor John.

  2. #2
    Super Moderator Alex's Avatar
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    Going over 10% pigment starts to soften gels and topcoats. If you add 5% cream to the [roughly 10%] white you wont achieve full hardness but I don't expect it to be significantly compromised.

    Basically any pigment is a contaminant, the more you add the more it will affect the resin you mix into it.

  3. #3
    Junior Member
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    so basically I should use as little as possible, many thanks for the quick reply

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