How to Patch and Caulk Before You Paint

Prepping

How to Prep Exteriors

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Patching and Caulking

Here's an easy way to patch small cracks and caulk holes to achieve professional painting results.

Essential Tools and Materials

Here's everything you'll need to get it right the first time.

Wide blade wall scraper	Putty knife
Sandpaper (coarse, medium, and fine)	Sanding blocks
Wood Filler	Masks and Goggles - to protect eyes and lungs while sanding or handling solvents
Exterior-grade patching compound	Caulking gun
Exterior-grade caulk	Dry paint brush
Disposable gloves

Fixing Small Cracks in Wood Siding

Use a scraper or some sandpaper and a dry paint brush to remove all dust and debris.

Hairline cracks can be sanded. WARNING: large cracks need to be repaired. Follow the exterior patching compound's manufacturer instructions. Let dry thoroughly and feather the edges smooth with sandpaper.

Caulking Windows and Doors

Remove all old caulk with a scraper.

Make sure the surface is clean and dry. Using only exterior grade, paintable caulk, seal the edges around window casements, door frames, corners and trim—anywhere water could possibly enter your home.