I recently over painted a work that I decided needed it. The acrylic work had an area with R & F oil stick on it. I thought the gel medium would allow this to be fine but need to ask.The R & F was rough.
I concur that it is generally not appropriate to apply water-born acrylic dispersions over oils and waxes while the converse will generally work.
I agree with the comments already made. As Kristin asked, if by “rough” you mean rough in texture, but even then an oil film would not have the porosity that might overcome the oil film’s natural resistance to the acrylic. On the other hand, the presence of wax in an oil stick may have an effect one way or another on that resistance. We’ve never tested for that, but it might be a good thing to do so. Richard Frumess, R&F Handmade Paints
In short, the answer is “no” it is not a good idea. It is not considered best practice to layer acrylic paint/mediums over oil-based media in general. But if you choose to do so please record your materials and layering process on the back of your painting so that folks will know how best to care for your artwork in the future….I am unsure, however what you mean by the “R&F was rough”….rough in texture?
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