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MITRA Forum Question Details

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  • Acrylic paint applicationApproveRejectUn-ApproveSubscribeUn-Unsubscribe
    Question asked 2017-03-31 03:29:55 ... Most recent comment 2017-04-03 16:50:00
    Acrylic Paint Mediums
    Question

    ​I am applying artist acrylic paint diluted approx. 10% with water onto a gesso prepared surface, with a small fine foam roller. The paint is foaming and although I can remedy this eventually, is there a way to prevent the initial foaming? Thanks.

Answers and Comments
  • EditDeleteModerator Answer

    ​While there are food-grade defoamers available to consumers that are similar to those used in the paint industry, I hesitate to recommend them since the analogous materials for paints can affect adhesion and film integrity when added in incorrect amounts. Before modifying the paint/primer, I would test different rollers. Manufacturers of architectural/house paints give guidelines for the best type of roller to use for diluted paints so bubbles don't form, so I think it makes sense to try this first. 

    Matthew Kinsey
    Utretcht Art Supplies

    2017-04-01 11:41:48
  • EditDeleteModerator Answer

    Hi, our response would be along the same lines as those from Matthew Kinsey, from Utrecht.  In general water based materials are prone to the stabilization of foam, and in formulation defoamers are incorporated to reduce this issue as much as possible while not causing other surface defects. 

    As far as prevention, it really comes down to technique. Foam rollers - in an ironic twist on their names - are notorious for foam generation, as their pores force air into paint with each compression.  A fine nap roller will reduce this greatly, but in general we recommend trying to avoid rolling altogether if wanting a relaiablly foam free surface. Sprayting will always be the gold standard in this area, and while we realize that would represent an investment and learning curve, if wanting a perfect surface, that is by far the way to go.

    Hope this helps.

    Sarah Sands
    Senior Technical Specialist
    Golden Artist Colors

    Sarah Sands, Senior Technical Specialist, Golden Artist Colors
    2017-04-03 16:50:15
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