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First off lets ask why you want all the panels blasted? Has the truck been repainted? Is the factory paint peeling or flaking? These are reasons to strip old paint. If the old paint is original, and it's just dull, then don't strip it. It is almost impossible to get a better adhesion than what the factory does. When you strip the old paint, you loose most of the primer and some of the filler too. This gets expensive to replace if done correctly.
Ok, so you still feel like it should be stripped. DO NOT sand blast your panels. It will heat the metal, and warp it. It will also harden it, and make it tough to get straight again. What you want to consider is called "media blasting" and comes in many different forms. They use anything from baking soda, plastic pellets, to ground walnut shells. These are all different types of blasting systems that are safe on sheet metal. It will add to the expense of getting the final paint work done too.
Unless you plan to take every part and panel off the truck, DO NOT use chemical stripper, or have it chemical dipped. These processes take EVERYTHING off. If the residue is completely washed and cleaned, you new paint will fail. It is only for the serious restoration project.
Your best bet is to talk to the shop you plan to have paint it. Discuss what you want done, and let them tell you which way to go. If you plan to paint it yourself, you better do more research...
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