I decided to spruce up my old red oak finish (15 year old oil/poly satin). It was in pretty good shape just some scuffs/scratches. Did a pass with a U-sand at 120grit followed all prep and app. to the T. using Minwax Super Fast Semi Oil. First coat looked pretty good - even and semigloss finish. Decided to do a second coat as long as I was at it. Sanded with a large fine screen and put on another coat which dried very dull with shiny patches. Third coat still dull with almost no shiny patches I'm using semi-gloss but the result seems to be satin or duller and uneven. I don't want to keep re-coating. What now?
Dave

I suggest you allow that finish and floor to dry and cure awhile before going at it again. At least three days under good conditions. Then abrade the floor with very fine screen (220) and hand sand areas you cannot screen with 220 such as edges and corners. The buff using 3M's Between Coats maroon pad to further smooth the floor. This should buff out any screen marks. Then vacuum very well, tack thoroughly and apply a final coat using the same finish or similar. Application rates are typically 500 ft. per gallon. Too thick and it won't dry or cure properly and too thin and you may have missed places or uneven sheen level.

Thanks, I'll follow that prep advice and do a recoat. To me the Minwax seems thick. When applying with the lambswool it seems you have to either put it on heavy or it tends to brush out and get "scratchy" very fast. I wonder if I should try another compatible brand that would flow out a little better?
Thanks, Dave

Around here, you can get a Minwax poly in qts. that simply says "Fast Dry" and that is is great for floors. This has a thinner consistency and maybe be easier to apply. Sounds as if you are using that 350 VOC thick goo that comes in gallons.