If the compressor doesn't meet the CFM requirements of the gun it's just not going to work right..... As for using it with a DA, maybe but it won't keep up at all and dang near impossible to use an inline sander.... Another thing, a little compressor having to work so hard to keep up is going to generate a lot of heat and a lot of moisture, a final filter at the gun isn't going to provide sufficient filtration... Maybe check in to renting or borrowing a bigger compressor or renting somebody's paint booth to apply the paint? Check with your friends that do body work and see if they can help you out...