Back panel of bed sandblasting question

[msg]

On the back panel of my 66 the top portion rolls over and is spot welded. I dont think that the blaster I am going to take it to has any special technique or tools to deal with, he might. If there isnt some kind of an attachment that he uses to thouroughly blast that inner folded over loop at the top whats the best thing to do? Drill out spot welds and pull it up enough so the blaster gets all the rust out?

Here is what it looks like