coloring agent for epoxy or polyester

Discussion in 'Fiberglass and Composite Boat Building' started by fishweed, Dec 1, 2006.

  1. fishweed
    Joined: Jun 2006
    Posts: 45
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    Location: san leon,texas

    fishweed Junior Member

    is the coloring agent the same for epoxy as for polyester resin?
     
    fishweed, Dec 1, 2006
    #1
  2. PAR
    Joined: Nov 2003
    Posts: 19,126
    Likes: 498, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Dry pigments (powder) can be used in either resin. They are available from your local paint supply store.
     
    PAR, Dec 1, 2006
    #2
  3. Herman
    Joined: Oct 2004
    Posts: 1,618
    Likes: 94, Points: 48, Legacy Rep: 1240
    Location: The Netherlands

    Herman Senior Member

    Paste type pigments are resin-specific.

    Epoxy paste pigments are usually powder pigments, dispersed in a drop of epoxy resin.

    Polyester paste pigments are usually powder pigments, dispersed in either polyester resin or styrene, or even another carbo-hydroxen based resin.

    The 2 should not be mixed up. However, when I was working in the epoxy flooring industry, we SOMETIMES used polyester pigments if epoxy pigments were not available (only at very specific colours. Who wants a purple floor anyway...) However we sometimes noticed some colour drift, not nice if it is a big floor...

    The other way round (epoxy pigment in polyester resin) is something that I definately do NOT recommend. (possibility of cure inhibition)

    Make tests if in doubt!!!
     
    Herman, Dec 6, 2006
    #3
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