Apologies for reanimating the dead. The expanding foam method was my last attempt at fixing hairline cracks in plasterboard ceiling. I've tried most other methods 'fixing from below'.
https://www.youtube.com/watch?v=4h6wDU1 ... Decorating
A couple of weeks later, all was still good. Another week and the cracks were back. I was utterly crestfallen. Bottom line - this 'so called' bomb proof method may work for you. It didn't for me. I truly believe that plasterboard board movement has to be fixed from above in the loft in the case where ceilings are cracking. Alternatively, lining paper. Both methods are too much trouble for me as a DIYer. Scrim and skim is a crock. I've had work done by several plasterers over the years and all have said that they can't guarantee cracks returning despite use of scrim tape.
Perhaps next time I'll try this:
https://www.toupret.co.uk/professional- ... m-surfaces
I've recently used the regular interior powdered filler from Toupret for the first time. Not quite as easy to sand as Easifill, but no flashing/grinning. Next time I'll revert back to Easifill rather than regular interior Toupret filler and spot prime with Zinsser Bulls Eye 1-2-3. Reason being is that the regular powdered interior Toupret filler can be a bitch to blend/flatten at the outer edge and make an undetectable transition to surrounding surface beyond the filler. I've had times when that 'edge' just Will Not Go, and no matter what I try I just end up with either an edge/lip or all the Toupret is removed. Easifill doesn't have that problem. In saying that, perhaps the Toupret fine surface filler might be the product. The whole crack fillin' biz (oo-er Mrs!) is a pain in the peach! Oof!
Covering movement cracks with Fibacryl
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