What would be the way to repair those stress cracks along the metal bead on outside corners? This would be prep. work before painting. On "You-Tube" they told of a product called "stress crack tape" sold at SW. Or is there a better way?
Take a putty knife and gently widen/deepen the crack about 1/8" deep and wide to allow the spackle to get a foothold. Tap the surface gently with your finger to sound out any loose spackle between the crack and the corner. Gently pick out any loose compound. Dust it off and spackle the crack. Apply as many skim coats, skim coats, that it takes to fill the crack. Sand it, prime it, and finish. Don't use any kind of tape on outside corners, ever. It's not necessary. Tape is for inside corners, joints, and stress cracks only. What occurs on the corners is not a stress crack in the true sense. Putting tape on the corners will result in a bulge on the corners, as there is not enough room between the crack and the corner to feather out the patch.
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