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Reducing absorbency of acrylic primerApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2020-12-13 10:56:03 ... Most recent comment 2020-12-14 15:13:47
Rigid Supports Sizes and Adhesives Flexible Supports

I'm using an acrylic primer to prime an MDF panel for subsequent (possible) acrylic underpainting, then ultimately oil painting.​ I've previously had problems with such surfaces "grabbing" the brush, making it almost impossible to blend paint nicely, as well as the paint drying out very fast/oil colors sinking in. I've heard two different bits of advice:

  1. Use PVA to seal the primer by applying a thin layer. 
  2. Use egg white, spreading it thinly and allowing to dry before painting.
I've tried acrylic medium before, but I found that it didn't improve the brushability all that much, it still has a certain "grab" to it.
Would either choice be better? Also, would the same advice hold for flexible support?
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Moderator Answer (brian baade)

[2020-12-13 18:13:16]

I would normally suggest either adding additional acrylic medium to the ground or applying an additional size layer on top of the ground. I can see no advantage to using PVA but this could be done. I would not have thought of using glair for this purpose. It will become slightly grey, become more brittle, and insoluble over time but this is not a huge issue if it is covered with oil paint and the work is on panel. There is far less of a lipid component in white as compared to yolk and therefore the migration of free fatty acids is less likely. I would not use egg white on unrestrained fabric substrates.

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[2020-12-14 15:13:47]

I have found that the smooth surface of a Aluminium Composite Panel (coal coated with a white polyester finish) is smooth and slick so perhaps it is the MDF is not smooth enough, or there is a smoother finish with a sprayed application of primer?

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