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Cracks in Drywall: 5 Steps to a Permanent Fix with 3M Patch Plus Primer Step 1: Apply Fiberglass Mesh Tape to Your Drywall Crack. Step 2: Add a Thin Coat of Patch Plus Primer to the Drywall Tape. Step 3: Add Your Second Coat of Patch Plus Primer. Step 4: Lightly Sand the Patch Plus Primer. Leah answers a viewer's question about stress cracks, and she shows one of the the best ways to repair them in walls and ceilings. Visit this week's sponsor. How to Repair a Plaster Wall Step 1. The first step is to prep the area by removing any loose or flaking plaster. Once the surface preparation is complete, mix up only the amount. Apply the mixture with the 10' wallboard knife and spread a 1/4'-inch layer over the hole. How to Repair Cinder Block Walls - Patching Cracks with Concrete Patch smaller cracks or holes with concrete. Mix the concrete. Mist any cracks or holes with a handheld bottle. Fill in the cracks or holes with concrete.

Buy a fresh tube of paintable silicone caulking.

Caulking is useless once it becomes dry.

Apply a thin bead of caulk into the crack.

Be sure to get the caulk actually inside the crack.

Smooth out the caulk bead.

You can use a wet finger if the crack is small enough. If not, use a 5-in-1 tool or a putty knife.

Smooth out the caulk bead.

You can use a wet finger if the crack is small enough. If not, use a 5-in-1 tool or a putty knife.

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Clean away excess caulk.

Wipe the excess caulk away from the outside of the crack. Rubbing alcohol works great.

Paint over the patch with primer.

Don’t skip this step or you’ll end up with a permanently goofy-looking, non-matching area.

Apply touch up paint to the patch in your wall color.

This is why you saved that half a gallon of leftover wall paint.

Gather your materials.

You’ll need a 6-inch taping knife, a 10- or 12-inch taping knife, 1 square piece of plywood or a plastic mud pan, drywall compound, drywall tape (paper or fiberglass), and fine-grit sandpaper and a sanding block.

Clean out the crack.

Use your taping knife to scrape the edges of the crack to remove any dust.

Put some compound on the plywood or mud pan.

This makes it easy to load onto the knife.

Put some compound on the plywood or mud pan.

This makes it easy to load onto the knife.

Apply a light coating of compound to the crack using the 6-inch taping knife.

Make sure that the coating is wet but not thick.

Embed the tape in the compound immediately.

Lay the tape over the compound you just applied and use the knife to push the tape into the compound. If necessary, cut the tape in short lengths to follow the line of a really crooked crack.

If you bought fiberglass tape, you can skip the embedding coat of compound under the tape because it is self-sticking. Otherwise, you do everything the same way.

Warning: Fiberglass tape is thicker than paper tape, which makes it harder to repair invisibly.

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Scrape the tape with the wider knife to scrape away any excess compound.

Use a smooth scraping motion.

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Scrape the tape with the wider knife to scrape away any excess compound.

Use a smooth scraping motion.

Apply a thin coat of compound over the tape using the 6-inch knife.

Be sure to feather the edges. Let the patch dry completely (usually overnight).

After the first coat is dry, apply a second coat with the wide knife.

By using a wider knife, you blend out the original edges. Make sure to feather the edges again. Again, let it dry.

Allow to dry and then apply a final coat.

Follow the same procedure as before.

Allow to dry and then apply a final coat.

Follow the same procedure as before.

Sand the patch until smooth.

Use a fine-grit paper to smooth out the surface.

Paint over the patch with primer.

Don’t skip this step or you’ll end up with a permanently goofy-looking, non-matching area.

Apply touch up paint to the patch in your wall color.

This is why you saved that half a gallon of leftover wall paint.