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I tried these for the rawl plugs holding my curtain rail support hooks. All instructions followed to the letter. I even waited an hour extra for the drying process to fully happen and as soon as even slight pressure was applied (not even the weight of the rail *without curtains*) the whole thing came out in a crumbling mess. Worthless.
Rubbish, we used these o put back up a Vertical Blind, used 3 on each but after week just fell down overnight. We received one of the bags split so cardboard sleeve full of plaster. In end it was easier to fill hole with ready to use mortar, redrill then skim over with fine filler and dab of paint.
This is the worst DIY product I've ever bought. For £7.75, you get a few small cloth discs impregnated with what look like plaster. It didn't work at all and isn't worth the money in any way. If I could give minus stars, I would.