air compressor size????

i had a cambell housefeld for a few years 15.6 cfm at 100 psi. just did the job running da and inline sanders but when i would run my sandblaster i would have to stop after 10 minutes.it was 7.5 hp and 80 gallon bought used for 500.00

sold it and bought a international commpressor with80 gallon 7.5 hp. same size unit but it has rating of 25.6 cfm at 125 psi. let me tell yhou.....what a difference it is a 2400.00 air compressor but worht its weigh t in gold. i give out before the compressor when sandblastiing. i have gone trought8 100 lb bags of sand and it will still be holding 100 or more psi. bought it from friend for 300.00 he bought some 150 gallon 15 h.p and is used commercially 18 hours a day running 5 air tools at a time on big rigs. that one cost hime 14k

above posters,are correct. all you really need to worry about is cfm at given psi.
my 15.6 was great, but when using for long period of time, i could see it slowing down,and air comming out would be real hot, which also slows to tools down