Earlier this week I rolled the car out, removed the rear bumper and trim and blasted the one side of the trunk lip. However, it was very slow going. Initially I was using coal slag but switched to aluminum oxide because the coal slag just wouldn't cut through the rust. I did eventually get the passenger side mostly done but it wasn't as fast or efficient as I'd hoped.
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Irritated by my lack of progress with that, I cleaned up the media and used some Prep and Etch to clean to up some of the lighter surface rust inside the trunk. It works well for that use but I'm going it need something more aggressive to clean the heavier rust.
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This process is going a little too slow for my liking. I can't bring myself to POR-15 over everything nor can I bring myself to pay someone to blast it for me. So I'm leaning toward renting a big diesel powered trailer compressor and a bigger sandblaster, buy the media and have a long, messy weekend blasting all of the PITA areas. It'll still be expensive but probably will be the best compromise between price, speed, and effort. I'm gonna start calling around and getting rental rates.