How Can I Varnish Oil Paintings?…
Oil paintings need to be protected and this can fairly easily be achieved by varnishing it properly. If you have never done this, then this guide ought to help you. Once you have finished varnishing the painting it will then have a strong, protective layer over it. This will ensure that it is easier to handle, will not get damaged so lightly and of course it will also make it possible to clean it.
As the painting dries out the oil paint tends to get duller and gives a matt finish. However, you cannot varnish until the paint is completely dry and this can take a considerable amount of time. I think sometimes you would probably need to clean it first.
Ordinary liquid detergent should be quite sufficient to do this. Using only a very small amount diluted with cold water to cover the surface of the picture, rubbing it very gently with a soft soaked piece of rag. Then maybe do the same with clean water, so there is no residue of the detergent used. It then needs to be left to dry thoroughly in a warm atmosphere.
Another important point to remember is, of course, to ensure that you do the varnishing in a dry, warm and clean environment. If the surroundings are moist you may end up with patches of white when the varnish has dried out, which is certainly more then annoying.
Spray varnishes these days are quite good, but like myself, most artists tend to prefer to apply the varnish with a good brush. Ensure that the brush you use for this is fairly wide and soft. I would advice you to make sure that the painting, brush and varnish have been near some heat for some time before you start the varnishing process. That way they are all at the same dry room temperature and you have ensured that there can be no damp. I use an old tin lid, pour some of the varnish into it and then carefully and gently brush it on.
Do not make the mistake of brushing backwards and forwards, this will only ensure that you end up over-brushing, which of course, is not so good as the varnish will tend to create bubbles on your painting. On a small painting the job is clearly easier as you can simply brush across from one side to the other. The trick is to try and get as thin a layer as you can possibly manage to achieve. If you over-varnish you will end up with a thick coating and an annoying glossy finish.
A larger surface requires a different technique. Try to divide the painting into squares and then work on each section laboriously a square at a time. You also ought to consider to be sitting in a well lit area while doing this, so that you are bale to see any spots you might have missed. After you are finished ensure that the painting is in a secure place so it may not be disturbed until completely dry.
Your picture then needs to be in a preferably dust free area if possible, with the face side up. Then you may find that you need to retouch your varnish. Obviously for this you need a thinned down varnish, especially where you may have what appears to be dull parts.
Make sure that you are not using too much, but you can normally use it on top of half dry varnish. If youre painting ends up looking quite dull as it is drying, then this is most likely the result of over-painting layers. Following this guide will hopefully avoid this happening to you.