Model Master's Clear Gloss Lacquer

Lacquer thinners, to my knowledge, are pretty much the same across the board. Testors might be a little "hotter", but you shouldn't have any trouble regardless of the thinner you choose. Since this is a clear lacquer, pigments aren't going to get in the way, so a 1:1 might be a little too thin. Try a couple different ratios 'til you find what works for you.

Just as a side note, for decaling, I've been using Testors clear out of the spray can. I spray some into a plastic cup, and then use a brush to apply to the area where the decal is going to go. No muss, no fuss.
Gip Winecoff

I've always used plain 'ol lacquer thinner from the hardware store or Wal-mart. A 1 to 1 ratio would be fine or less thinner if you want a heavier coat. Experiment on scrap to see what you like on the ratio. I use the cheap stuff because you want to run a good bit through your air brush to clean it afterward. Make sure you get it real clean or you'll never get the lacquer out after it sets up for a while.

Eric

I just used the MM Clear gloss laquer using the manufacturers suggested mixing ratio of 3:1 paint to thinner on my A-6E Intruder. The results were very good. The layers built up well using a Paasche-H#3 tip and compressor set at 15 psi. I generally use Future for my clear coats but I cant beat how fast this quality clear laquer dries in preparation of decals as well as a finishing coat. Like others mentioned, I didn't bother with using the MM laquer thinner- I use the store bought thinners, except when thinning MM enamels for airbrushing. The MM A/B thinner seems to atomize the paint perfectly. Happy modeling!