How do I varnish a painting?

I have a painting that has varnish on some parts of it, but not all. I am new to painting. How do I apply varnish to the rest of the painting? Should I use a brush or spray on? Will it matter if I apply new varnsih over the old varnish?How do I varnish a painting?
Brush it on or spray either way you want to be sure what you've got first before adding anything like a new varnish. One should add the same varnish on it that was originally added if at all possible.


Secondly know if it's an oil painting or acrylic, since they take different varnishes and if you varnish it thinking it's one type and not the other but find out later you were wrong you could seriously damage the painting beyond repair.


Thirdly if you want to do it right take it to an art restorer at a museum, or contact a local art gallery and see who restores paintings in your area. Ask about prices, experience and knowledge, and background of that person. Then decide if it's all worthwhile.


Fourth, if your going to do it anyway by yourself, putting a new coat of varnish over an old one could discolor the painting in a matter of a short time. What needs to happen is for the varnish to be removed and the redone in a uniform way or not at all and have it left to breath the natural air in as much as paint does best that way after-allHow do I varnish a painting?
1st it depends on what kind of painting, oil or acrylic


There is different types of varnishes for each


Also what kind of varnish is already used on the painting?


There are different kinds such as mattes, gloss and high gloss.


In paintings you can always do layers. But you need to stick usually with the same varnish or else it will be unevem and patch. Also mixing oil with acrylic mediums is tricky and not recomended although it can be done.


To apply varnish you can use a brush. Sometimes I use one of those sponge brushes so you don't see brush marks when it dries.
If the painting is valuable, DO NOT varnish it as that will lead to deterioration of the painting. It is better to have the old varnish removed if it is worthwhile. They stopped varnishing paintings many years ago when they found that the chemicals in the varnish can damage both the oils in the paints and the canvass itself.
I just use a spray varnish, I'm not an expert but I would jus tuse a non yellowing spray varnish over the whole picture, even over the old.

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