I wanted to put some more pics of my wheel wells up. I covered the wheel wells in fiberglass to prevent the sharp metal edges from cutting the canvas covering when it was applied. My fiberglass had rough resin edges of its own but I was able to grind those down and get relatively rounded edges. I then painted what exposed metal was left along with the fiberglass, I used Bonds Primer from Menards. It is comparable to Glidden Gripper. Then I filled in the top with light weight spackle and blocked that down until it was reasonably passable.
In the first pic you can see how I wrapped the wheel wells in fiberglass. Its ugly in this pic.
Second pic one of the wheel wells covered with light weight spackle and blocked down.
The third pic is of the wheel well covered in canvas. The canvas wraps right around to the other side. Turned out pretty good.
FYI:
I am soaking these huge sheets of canvas in a 5 gallon bucket full of tightbond and water before applying the canvas to the wall of the trailer. As you can imagine the canvas comes out of the bucket very wrinkly. In the third pic it looks like the applied canvas is wrinkled all over. While the wheel well spackling job was lacking and not entirely monolithic I just want to say all the wrinkles you can see are not really there. The canvas is flat. Its like you can see the memory of the wrinkle in the canvas even though it has been flattened out. I might have a wrinkle here or there on each side, but over all they all came out very flat. Up close you can see all the patterns of the wrinkles that were there before the canvas was applied.
Hopefully they will disappear under the paint.