Artists use this to make paint. Anyone use it as a finish? If so, do you mix it with regular linseed oil to thin it out? Does it need to be mixed under heat?

Also, i have a marine varnish Le Tonkinois in which the last 1/4 of it solidified in the can. Can that be liquified in either tung or linseed oil to give a little sheen? Again i would assume some heat would be required.