Sanding the sheen off polyurethane?
I have a question on polyurethane and sheen levels. I have a sample piece of a bar top that is stained and I tested three different polyurethane sheens as a protective finish (Minwax fast drying polurethane Satin, Semi-gloss, and Gloss).
I sanded between coats on my sample piece with 400 or 600 grit sandpaper to remove bubbles and increase adhesion. After the last coat, there were still bubbles and imperfections. So I spot sanded with an extra fine sanding sponge. It worked to remove the imperfections, but then the sheen was uneven. Any place that was sanded was substantially less glossy than the unsanded areas. So I decided to keep sanding until it was even and I found that I had sanded off all the sheen of all three samples of polyurethane. In fact - I couldn't tell the difference between the three samples of polyurethane when I was done. At first I thought I sanded off 4 coats of polyurethane with an extra fine sanding sponge, but touching it made me realize it was a very smooth hard surface still in place. That said, I think I liked the zero sheen look the best. It looks like there is nothing on the wood and is smooth.
So here are my questions for you experts out there.
1. Is it okay to sand off all the sheen on polyurethane? Does it still protect as well? It doesn't look like its even there, I can only feel it.
2. If it is okay, does it matter which polyurethane sheen to use? Satin, Semi-gloss, and gloss?
3. If it is not okay, can I just wipe on a final coat of "wipe on poly" and get full protection of the built up polyurethane but a bubble-less finish as well?