Originally Posted by
21boat
You can't "varnish" out a stain If the stain penetrated the sealer and got to the wood stain its sanding time. I don't know how much work you want to do but heres is a good way to redo.
sand whole top to take sheen of old finish off. and you will see if the stain is just in the sealer. If it goes away now dust free it (tack rags) and use a ext spar urethane at what gloss you want. If stain doesn't quite go away sand down to it disappeared. If this disappears to bare wood 1 of 2 things sand down the whole top or get a close stain to match and use a old sock not a brush and re stain. The sock helps to control the darkness of how much stain will soak up and help match the other stain. If its old a Maybe redo the whole top because the sealer is shot; I use Spar urethane it wont water spot so easily. I use that on boats and think of that water. forget varnish If you want to see a better explanation of staining and sealing go to my profile and click on "Exterior wooden door sealing and fishing"
Happy Holidays! 21boat!