I bought it today, and used it to lay down some Seal Coat on some parts. The parts range in size that might be in a typical end table or night stand. The Critter had no problem laying down wet coats of full strength Seal Coat at 40 PSI. I'd say about 20% SLX would make it perfect.
This thing is really terrific! I was able to keep the sealer in a jar, some SLX in another jar for cleaning, and quickly and easily whip the thing out for use. I can't wait to try it with lacquer and dye stains.
I wish I bought this thing a long time ago. I won't be painting any entertainment centers with it, but it sure makes small to medium spray jobs go quickly.