Paper towels are light enough that they can support their own weight by creating friction against the inner walls of the hollow door.
You can purchase foam insulation at any local hardware store or home-supply store. If the store has a variety of options, purchase a low-expansion type. This will leave you with less cleanup.
The expanding foam needs to be completely dry before you start trimming. If the center of the foam is still wet, wait a few hours until it’s fully dry.
Start out with about 1 teaspoon (4. 9 ml) of the auto-body filler and half as much catalyst. Mix more as needed. Both auto-body filler (such as Bondo) and a hardener catalyst should be available at a large hardware store. If not, check a home-supply store or an auto-body business.
After about 5 minutes, once the filler has started to thicken, take the edge of a putty knife and scrape it across the filler. This will smooth the surface and remove any excess, semi-dry filler. Wait to proceed until the filler has fully dried.
Sandpaper of all grit consistencies will be available at your local hardware store.
You can find spackle at any hardware or home-supply store.
The paint that you use should match the color of your door. In order to find a good match, visit a paint store, bring home multiple swatches, and find the color closest to that of your door.
