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Can someone tell me?
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Posted
You can get oil paints to dry quickly if you use W & N Liquin as a painting medium.
Acrylic paints on a surface often appear matt rather than the semi gloss of oil. If you can see lots of sharp edges and boundaries between patches of colour, it may be acrylic. By contrast oil is a lot easier to blend and smudge.
Posted
If I accidentally do paint acrylic on oil or begin pasting paper and stuff onto it - how long before I see the effect, cracking, peeling, whatever?
These canvases have been sitting in an attic many years. (wrapped)
I've succesfully removed most of the paint from canvas by smearing with brown soap and cover in plastic overnight, because I had the same problem with some of my own. I just really don't want to do that here...
Would be great if I could just rub a corner with turpentine or something and get some reaction if it's oil.
Posted
Well you can but try = and if you use them basically as practice pieces, it's not going to matter much if they don't last as long as the Mona Lisa. To take a few points: Liquin will normally dry in a couple of days at most; and an acrylic gesso over oil isn't going to succeed in separating the layers - it's still acrylic, and what usually happens is that bubbles start to appear under the paint - these grow and spread until you can peel more or less the lot off. Unless you're quite sure these part-finished paintings are acrylic, I would hesitate before using acrylic to paint over them (from the sound of it, they are, though). <div>
</div><div>You can of course paint oil over acrylic, or over old oil paint - you might want to give them a light sanding, if only to provide a bit of tooth for the paint. Rubbing turps into old oil paint shouldn't have much effect, by the way - whereas it can, depending on the brand and thickness of the paint, start to smear acrylic.... so it's not much of a guide.</div><div>
</div><div>In short - safest method is probably to over-paint in oil; but you lack the space to do that, which is a bit of a bugger.... I have very little space myself, though; I live in two rooms, one large, two tiny - I still manage to find space to dry oil paintings, and if I couldn't: I'd move!</div>