Do any of you have good working experience with Stewart Systems Ekofill?

I know they recommend at least 13 CFM for good results on the top coat.

I am hoping to utilize my 5.5 CFM compressor for the Ekofill portion. Which of course would necessitate a smaller gun.

For the Ekofill, can this be done with a smaller gun (as it gets sanded anyway between coats)?

Larry S.