Removal of rear inner fender directly above tires (wheehouse) on a 1991 Chevy K1500 pickup

Hi everyone,
I have a 1991 Chevy K1500 1/2 ton pickup. It's not a step-side where the rear fenders are on the outside, but a regular bed with the
fenders on the inside of the bed. I have a couple of links below to some pictures of trucks I found on-line to show how the body and fenders are on this truck..
I want to remove the front and rear "inner fenders" directly above the tires, (the factory manual calls these wheelhouses) so I can spray some cavity wax rust inhibitor on the inside of the front and rear fenders since they tend to rust from the inside out just above the outsides of the tires where the fenders are flared outward a little. The wheel-house is covering the area I need to inspect and spray. I want the spray the entire inside of the front an rear fenders and insides of the side bed panels. I would also like to inspect the top side of the rear wheelhouses for rust and clean and paint as necessary.
The factory manual gives instructions for removing the front wheelhouses, which is basically removing the front wheels, taking out the wheelhouse bolts, and then removing the wheelhouse. The manual also shows a front "fender wheelhouse flare" that I didn't know was in there.
However, the manual gives no instructions for removing the rear wheelhouses and this got me thinking that they might be spot welded and not really removable. If I remove the bolts to the rear wheelhouses will they pop out or are they spot welded as well ?
I would appreciate any feedback or advice.
Thanks John
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