Question about lacquer

I have been building a platform to put on top of my existing desk to turn it into a standing desk. Since it was cheap and easy to use, I build it out of mdf and stained it using minwax gel stain which went really well. I wanted to seal the top (and maybe the sides) just in case I spill anything on it and to smooth it out a little more so I bought minwax clear brushing lacquer. I put on my first 3 coats today (2 hours apart each) with a bristled brush and everything went pretty well until the 3rd coat dried and I ended up with a little rough area and a couple bubbles. I was able to very lightly sand them down, but after I was left with some milky looking spots where I had sanded. I tried rubbing on them with a cloth and mineral spirits which didn't have much effect. I thought maybe I hadn't let it dry enough so I came back later and tried rubbing alcohol and that took out most of it, so moisture was maybe the culprit (?). If I put another coat of lacquer on, will that take care of the rest of the milkiness or will it just seal it in? Should I do some more sanding and then something else? Looking for some input from someone with more experience, which should be about anyone.

Submitted January 31, 2015 at 06:36AM by lazytiger21 http://ift.tt/1BFGzPe