Join Date: Jun 2004
Location: West Michigan
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Rep Power: 12
Backer rod and the grips would work fine.
Typically I use styrofoam blocks cut to shape and then wrapped with sand paper. It's stiff enough to sand well, but soft enough to conform without digging in.
The oversize sheets on a sander work well, but use the sander a bit on flats so the paper beings curling before you try it in the corners, a fresh sheet is stiff enough that it will often cut into the curve, leaving little gouges.