take it off and blast it and coat both sides... put junk bolts into any threaded areas of the body/flooor.. seat belts/seat etc etc etc letting them stick up at least an inch... then you can get a wrench on them for removal and have all the bolt holes clean and accessible for future use.... if you dont do this detail work and ever need to remove a bolt in the future you have to cut the lining up for the bolt access and then recoat... which is a PITA and costly....
I did the careful bolt prep on my v3500 and it is nice to be able to get to all the factory bolts but still have a clean coated bed, You cant do enough prep work... whenever I see a coated body its the first thing I look at.... if you never wrenched on your truck, used it and traded it in every couple of years for a new one I guess you wouldnt care.... but ck5 people seem to "tinker" every once and a while,,,,
cam