Just got done sand blasting the rear half under body (floor pan, trunk pan, frame rails, inner fenders....ect) of my 69. Curious now as to how I should prep all my surfaces prior to spraying epoxy primer? Would an air gun be sufficient in getting all the loose abrasive & dust off everything or dare I introduce a pressure washer into the mix to blast everything down considering everything is bare metal?? The media I used for blasting was Black Diamond coal slag and the car is located in a garage in MN. 5 day forecast is lows of 55 with highs of 75, no rain in sight. All advise is appreciated!