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MITRA Forum Question Details

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  • Golden GAC 400 as a final varnish for acrylic painting.ApproveRejectUn-ApproveSubscribeUn-Unsubscribe
    Question asked 2016-11-13 13:35:24 ... Most recent comment 2016-11-13 15:39:00
    Acrylic Varnishes
    Would Golden GAC 400 be OK to use as a final varnish on acrylic paintings? It foams less than Golden Polymer Varnish on a fairly rough surfaced acrylic painting. I see on the Golden site they recommend GAC 100 as an isolation coat before final varnish on acrylic paintings.

Answers and Comments

  • EditDeleteModerator AnswerHi -

    I would be happy to respond to your question about Golden products. First, NEVER use GAC 400 on top of any paint layer or other material. It is far too brittle as a continuous film and should ONLY be used on fabrics and papers made from natural fibers, where it is meant to soak into those materials to help stiffen them. Also, we do NOT recommend GAC 100 as an isolation coat because it is far too prone to foaming. You might be confused as we do often recommend GAC 100 as a barrier or sealer on canvas and wood as a way to prevent either Support Induced Discoloration, where water-soluble impurities from a support can be drawn upwards into a clear or lightly tinted acrylic glaze, medium, or gel, or else to block oil penetration into the canvas when working with oils. For isolation coats, prior to varnishing, we would recommend using a 2:1 mix of Soft Gel Gloss thinned two parts gel to one part water. For more information please consult the following Tech Sheet on the Golden website:

    Isolation Coats

    Sarah Sands
    Senior Technical Specialist
    Golden Artist Colors
    Sands, Sarah
    2016-11-13 15:09:50

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