Don't put the shielding around the light, put it around the part (valve cover), and point the light into it. Home Depot or Menards will have rolls of sheet aluminum that you can cut and bend to shape for your heat retainer/reflector. Put it on a concrete floor (or other fireproof base), and make it look like a box with one side open for the lamp to point in. That will hold the heat around the part and not let it radiate off into space.
For parts like valve covers and oil pans, I have also used a heat gun on the *inside* of the part (where there is no powder) to assist the light in curing nooks and crannies. Light pointing at the outside of the part, heat gun pointing at the inside of the part. You can watch the powder cure as you move them around. If you try this in the winter in a cold garage, it won't work.
Hemi-T
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