testors compressor

What psi are you getting?  The mini blue is rated 20 psi under load.  So I guess you can get 15-20 psi.

Maybe you have a leak.  I had a similar problem with an Iwata compressor. Wrapping the fitting on the compressor with Teflon tape before putting on the hose adapter fitting solved the problem.

well i have the mini blue, and i tried to adjust it while held trigger down it still dropped off, to aobut nothing. i just was not sure if compressor was strong enough.

Probably not. Did you buy the Blue mini or the AC100 (other Testors have a regulator)? You need to adjust the regulator to the pressure you want for spraying while pressing the AB trigger - normally about 15-25 PSI. Depending on which compressor you bought, it may run continuously while you spray but should maintain the set pressure, Nozzle size of the AB will have an effect though.