I am finishing out the top of a walnut table. Started off by sanded the top to 320 grit. Applied two coats of linseed oil. Then applied two coats of gloss arm r seal. Let the finish dry for 48 hours. Sanded the top down with some 600 grit. Applied 3-4 more coats of gloss then multiple coats of satin ( was having trouble getting streaks in the satin). Between each coat of satin I sanded with some 600 grit after letting it dry for 48 hours. I then sanded it from 800-2500 grit sand paper and some how sanded through roughly an 1"X1" area on the top. How can I fix this? Do I need to reapply finish to he whole top or can I just apply a small amount of finish to the area? It does not appear that I sanded through the linseed oil in the wood.
Also how many coats of finish before I can sand it out again?
And finally the top is sanded out to 2000 grit right now. Can I apply finish to the 2000 grit or do I need to rough it up with a courser grit first?