How to repair hairline cracks in old plaster walls?
Apply some moisture to the lath and plaster surrounding the crack. This will allow the patch to stick to the surface. Apply at least two coats of combination joint compound to the crack, then sand it with fine sandpaper until the surface is sufficiently smooth.
Is it normal for old plaster to crack?
A: Old lath and plaster walls tend to crack. Over time, the plaster separates from the lath, creating structural cracks. Plaster is also prone to finer cobwebbing cracks, which occur when the top coat of plaster degrades. It’s common to have both types of cracks – and both types can be repaired.
Why does plaster crack when painted?
The reason this step is so important is that painting on a damp wall can interfere with the bonds between your first coat of paint and the new plaster, leading to peeling and cracking, as well as an uneven finish. The new plaster is extremely absorbent and will suck up any liquids applied.
How to repair hairline cracks on a redone plastered wall?
Usually none of the other walls have this problem (a lump on a corner near a window) and the plasterer came back to do another section and mentioned thermal expansion/contraction. My plasterer suggested just repainting the cracks, but surely it will reappear?
Are there any hairline cracks on the wall above the radiator?
Discussion in ‘Home and Garden’ started by Buffman, Feb 22, 2018 . I recently had my kitchen plastered (plastered over old plaster, and since painted, etc.) and hairline cracks appeared above one of the radiators (the big one).
How to hide the fine hair crack that reappears afterwards?
Always overfill, allow to dry completely before sanding off the missing layer and repainting the wall to remove the repair area.
What kind of tape to use on hairline cracks?
obs: tape is very good but depending on the extent of the cracks and how far they move, soft putty is by far the best option. check that you used a soft compound when filling due to the general movement of the house. Always overfill, allow to dry completely before sanding off the missing layer and repainting the wall to remove the repair area.