Apply a bead of caulk to the crack and use a crosshatch pattern to work the latex substances into the crack. Do not apply the caulk along the crack or straight against it. Otherwise you won’t force the caulk back into the crack, you will actually pull it out of the area you want to fill. Allow the caulk to rest for about 5 minutes. Take a damp paper towel and remove excess caulk from the crack. Using Latex Caulk to Fill Small Drywall Cracks. To fill small cracks you need something that is liquid enough to penetrate the crack but drys to a finish that can be painted. The easiest material is a 100% latex caulk and this type of caulk just so happens to be the least expensive too. Patching Drywall Alternatives. One alternative to common drywall patching compound is paintable caulk. If, for some reason, you find your drywall cracks repeatedly (around the edge of a windowpane, for example), apply a paintable caulk that is also water washable directly into the crack with your finger. Cst free download. Though they may look scary, your cracked plaster walls are not beyond repair. You do not even need a special plaster repair kit. Driver asrock g41m vs3. One way to quickly fix cracked plaster walls is with basic drywall tools and materials that you can easily and inexpensively obtain at a home improvement store.