not really .. I use all kinds of sub straights .. wood blocks , wood strips , fingers plastic pieces ... what ever you think will sand it . just wrap a piece of sand paper around what ever fits the contour
See these pics what would be the best way to fill in the big voids little pieces of fiberglass?
Do I need to remove all the paint where im adding body filler into all the groves I cut where the cracks were?
Also got some fiber glassing done on for the big cracks too.
yes , you need to grind or remove ALL the old glass fibers and paint .. V notch these and drill 1/16" holes at each end of the crack . I would do this to ALL of them , then when your done , flip it over and do 1 layer of 1.5oz mat on the whole inside of the roof . that will secure everything .
Sorry this is on the back of the truck bottom, i did do that but i was trying to ask was i have to remove all of the paint around all the cracks i grinded if i do i pretty much have to remover the whole back side of paint.