Before you begin, find out what type of crack you have. If you see a vertical crack from the base to a window, door, or the roof, you may have a foundation problem. It is pointless to repair cracks such as these. Get in touch with a foundation specialist in order to have a crack repaired.
You can fix very small cracks by using a high-quality caulk. Be sure to use one that will accept paint. Press the crack with your fingers and then clean it up with a moist cloth.
Larger Cracks:
1. A chisel or old screwdriver that has been chilled can be used to remove the dirt and debris.
2. Be sure to soak the area completely. In that way the stucco won't absorb the water out of the new mortar. If this happens the mortar will crumble.
3. Use a shallow bucket to mix the mortar. Use one part portland cement to four parts sand. Add a little water so that your mortar is easy to work with and not liquid.
4. Top the section to be patched with polyvinyl acetate (PVA) bonding agent created for masonry.
5. Once the bond feels a little tacky, apply mortar mix until the crack is filled.
6. A section of bitumen-coated fiberglass should be placed over the patched area. Apply a paint roller to push it into place, then put on a coat of bitumen on top of the patch.
7. Allow the bitumen to dry. Apply a second coat. Stipple it with a soft-bristled brush so that it matches the remainder of the wall.
8. Prep the area with primer made for stucco or bitumen patching. Wait until the primer is dry.
9. Paint the area again -- you may have to paint the whole wall again so that the patched area will not be noticeable.
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