Hello All...
I'm new to this forum and to plastering - I'm only a "DIY-er" but have done a fair bit with reasonable success until now...
I had an old plaster wall that finished by running a thick brush through it then was painted with a shiny paint. I wanted to skim over the whole lot to make it smooth, so I applied neat PVA to the wall, then before it was dry I put on a skim coat of Thistle multifinish. Before this went off, I put on another 1 to 2 mm coat to finish. It looked not half bad (for me!!).
Anyway, two days later, I went to inspect and the whole of the second coat has literally peeled off - cracked & curved away from the wall. The first coat is fine and has dried out without cracking or losing adhesion to the original wall. What on earth would have caused this?
The first coat was not completely dry or "off" before I put on the second coat, "wet" enough to take the second coat, but not so dry it got pulled off by applying a second coat.
The only thing I can think off is that the bag of plaster I used for the second coat was a bit out of date? My neighbour says you get something called "bag set" where even though the plaster is powdery and mixes OK, it has in fact gone off. Would this have caused it?
Regards...
Ray
I'm new to this forum and to plastering - I'm only a "DIY-er" but have done a fair bit with reasonable success until now...
I had an old plaster wall that finished by running a thick brush through it then was painted with a shiny paint. I wanted to skim over the whole lot to make it smooth, so I applied neat PVA to the wall, then before it was dry I put on a skim coat of Thistle multifinish. Before this went off, I put on another 1 to 2 mm coat to finish. It looked not half bad (for me!!).
Anyway, two days later, I went to inspect and the whole of the second coat has literally peeled off - cracked & curved away from the wall. The first coat is fine and has dried out without cracking or losing adhesion to the original wall. What on earth would have caused this?
The first coat was not completely dry or "off" before I put on the second coat, "wet" enough to take the second coat, but not so dry it got pulled off by applying a second coat.
The only thing I can think off is that the bag of plaster I used for the second coat was a bit out of date? My neighbour says you get something called "bag set" where even though the plaster is powdery and mixes OK, it has in fact gone off. Would this have caused it?
Regards...
Ray