Before sand blasting the frame must be cleaned of grease and road debris. A pressure washer works well but can't cut the grease like a steam jenny. Steam jennies can be rented from rental shops. If you are able to haul your project vehicle to a car wash this would be an option that wasn't available to me at the time. 
    I have been working for the last three days on the frame while the weather is hot. Pressure blasting has not been without its problems and I made my share of mistakes along the way. High volumes of air required is sending moisture laden air through the blasting sand causing it to plug the outlet pipe every ten to fifteen minutes. The air compressors inline water filter could not handle the cfm of air required. I found out later the filter wasn't installed properly to collect water so I will have to redo . What should have taken a few hours has now gone into several days. To save money put up a barrier of some kind to retain as much sand as possible for reuse. Here in Alaska material I use is $15.00 a bag due to the freight costs, three 100 lb. bags were used to do just the frame. Depending on the winds and how well you enclose your area you can use much less.
    Bare metal parts that have been exposed by sandblasting need to treated to prevent rusting, which will occur rapidly if any moisture is present. If you are going to paint your chassis in the short term and to ensure good paint adhesion wash with Metal Prep or Metal Etch etc.

                                                                              7/10/99