Re: Problems with oil

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1397 by joe on 08/15/02 at 5:48 AM
Re: Problems with oil

In Reply to: Problems with oil posted by ashmead on 08/14/02 at 11:38 PM:

Paint shouldn’t come off unless it isn’t adhering to the under-layer. There are a number of grounds that you can paint on. Mostly people choose their ground for permanence, texture, and absorbency. The easiest thing to do is just pick up and apply a couple of coats of acrylic “gesso.” It has enough tooth to hold oil paint and it dries really fast. If you don’t want to muck with all that - you can actually pick up pre-stretched canvases that are already primed w/ground. If your painting on wood or metal just degrease the surface and rough it up with a bit with a gritty sandpaper so that it will hold the “gesso.” (It’s a good idea to put gesso on both sides of a wooden panel to minimize warping.) The thick over thin rule means that a layer should always dry before the next layer - to prevent cracking. You see this a lot in old paintings that have been glazed, on certain places, with a varnish-based medium that dries really quickly. It cracks because the paint underneath was still curing and moving long after the glaze had become dry and stiff. One way to avoid this, if you work on a painting in more than one session, is to add linseed oil to your paint or turp. This way it takes longer to dry than the paint underneath.


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Post a Followup 1396,1397"> joe"> josephjones76_hotmail.comRe: Problems with oil_08/15/02 at 5:48"Re: Problems with oil"
: Paint shouldn’t come off unless it isn’t adhering to the under-layer. There are a number of grounds that you can paint on. Mostly people choose their ground for permanence, texture, and absorbency. The easiest thing to do is just pick up and apply a couple of coats of acrylic “gesso.” It has enough tooth to hold oil paint and it dries really fast. If you don’t want to muck with all that - you can actually pick up pre-stretched canvases that are already primed w/ground. If your painting on wood or metal just degrease the surface and rough it up with a bit with a gritty sandpaper so that it will hold the “gesso.” (It’s a good idea to put gesso on both sides of a wooden panel to minimize warping.) The thick over thin rule means that a layer should always dry before the next layer - to prevent cracking. You see this a lot in old paintings that have been glazed, on certain places, with a varnish-based medium that dries really quickly. It cracks because the paint underneath was still curing and moving long after the glaze had become dry and stiff. One way to avoid this, if you work on a painting in more than one session, is to add linseed oil to your paint or turp. This way it takes longer to dry than the paint underneath.
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