I have also inquired in regards to getting my HJ sandblasted or soda blasted, was told the same that sandblasting can warp panels and as we know with vans there are big panels that can be warped. The guy that does the soda blasting in the southern highlands which is south of Sydney apparently does a lot of work for the Mustang Club based I imagine around Sydney ?? anyway he also suggested to get the car etch primed pretty much straight away or you are risking/promoting more or further rust problems. I also got onto another guy who is starting a mobile sandblasting business a mobile booth apparently. My panelbeater suggested if I wanted to safe money just to get all the joins, gutters, seams, sills tailgates etc done and strip the larger panels myself ?? So the plan for me is to get it blasted/stripped and identify and the areas which required rust replacement then take it to the p/beaters for that side of things and hopefully by then will have decided about the paint side of things. Blocker do you plan to do your van in 2-pak??