100 PSI would be too much air pressure on the lines. I am not how much PSI your lines can handle. I use about 40 PSI on mine and it is plenty to blow out the lines. I assume you can regulate the pressure on the pressure on the compressor you are looking at.
X2! Used the air pressure method with anti freeze in the p-traps the last couple years with no problems. Just keep your compressor pressure low. I keep it between 30 and 40 psi. Had a friend blow off a couple line fittings once because he didn't manage the air pressure