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If it's a gel stain you will need to practice on scrap, the stain becomes much darker the longer it's left on. You will want to seal the stain with shellac if you are going to wipe or brush on a waterborne topcoat. If you spray you might get buy without it. Test to see.
homo homini lupus
"The best lack all conviction, while the worst are full of passionate intensity." Yeats
Si vis pacem, para bellum
Quodcumque potest manus tua facere instaner opere Ecclesiastes
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Oh, do some separate test specimens first, without question. Pine is notorious for blotching. I don't use pine much at all, but I use other woods that blotch badly, like maple. The best way I've found to deal with the blotching is to spray dye or toner to get the color I want. Using a stain is just asking for trouble. The only time I use stain with it is as a glaze (gel stain) over a sealer. That goes on without blotching because you are working with a sealed surface. So, a very workable system is spray applied dye, sealer, wiped on gel stain, top coats.
John