Can I mix polyurethane and stain together to get a polystain?
No. You technically could as long as each has the same base (I.e., oil or water-based); however, you will likely not mix the proportions correctly and end up not getting the correct colouring. Also, the dried finish will appear cloudy. Either apply your stain and then your poly in two stages -- or, purchase a professionally mixed poly-shade product such as from minwax.
Yes possibly, oil with oil but the varnish may not have the right drying agents .Ideally when you want a consistent color the stain solid or penetrating is the base and varnish won't lay down as consistantly as you may hope, It Settles on low spots and. Misses on edges runs vertically touch it up. And you get double layered. Apart. From spraying. Tinted. Varnish is a last ditch effort to rescue to. Hide a bad tone not really for coverage. I sound like I am preaching. Sorry wish you good luck all the same.
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