Therma-Tru SHOP 3 Door Preparation - U1 Revised - Manual (Page 13)

Door
Preparation
Shop 3 2014 (U1 REVISED) 3.13
Slab Repair
Steel Door Dent Repair
Clean and Roughen Surface
Clean surface surrounding dent.
Roughen using 100 grit sandpaper.
If possible, do not sand through
the existing factory-applied primer.
Sand Dent Repair
Sand repair, using a large sanding block
or orbital power sander, with 220 grit
sandpaper.
Fill Dent
Fill dent using Therma-Tru Dent Repair
Kit, (Part Number: MS00DRK), or an automotive
body-filler compound.
Smooth using a wide blade putty knife.
Overfill to account for shrinkage and sanding.