It is designed to be varnished over. It can be used as temporary protection if you have to show a painting before it is fully cured. Then when you are ready for a final varnish, carefully give the painting a quick wipe with a solvent to remove any built-up dust and do a final varnish. Some artists also use it during their painting process to oil-out sunk-in areas, but many brands specifically mention that this isn't its actual purpose. But it does add gloss to matt areas.

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