Repaint
Step 1
Use a scraper to remove the bubbling paint from the affected area.
Step 2
Sand the area with sandpaper until it has a smooth finish.
Step 3
Apply a coat of primer over the area with a brush.
Step 4
Wait until the primer dries, which might take a few hours or up to 24 hours depending on the environmental conditions in your area.
Step 5
Brush on a matching coat of paint on the area. Avoid applying paint to an exterior wall when the wall is exposed to strong sunlight.
Permanent Fix
Step 1
Check for any areas where water might leak into the wood siding, such as poorly caulked window sills or frames. Apply a new bead of caulk around any windows where water might be leaking into the wood.
Step 2
Look for any plumbing leaks around bathrooms and kitchens or in laundry rooms.
Step 3
Check to see if water vapor coming from a humidifier might be causing bubbles.
Step 4
Inspect any metal flashing around doors and windows where moisture might get through. Ensure that the flashing is in good repair. Replace as necessary.