That is probably what else you did wrong. If you used a real plaster finish it needed to be troweled through its set not merely laid on and called good. If you used something else then Maybe you followed the instructions with that material and I can't tell you what you did wrong. I am making an assumption here that you used a real plaster finish like Diamond or Imperial finish plaster. You used bonding agent over your base coat. Use a bonding agent on the edges of all the existing plaster. Your other option might be faster: scrape it all off and mix is as I told you above and replaster. Since your plaster is dry it might take a few sprayings to get it set throughout. Mist it enough to soak it without putting enough on that it runs off and takes the plaster with it. then use a pump up garden sprayer to spray the StructoLite. It's a lot cheaper to buy it like that than in the little bottles in the grocery store. Not ammonium sulfate but aluminum sulfate. A more economic way to get alum is to buy some aluminum sulfate at the garden store. Mix up some alum and water solution that is strong enough that it makes you pucker when you taste it. If it is harder then leave it alone If it hasn't set you can try to set it.
If it has not it will be chalky and soft enough you can scrape it off with your fingernail. It should scrape off because you are going to take off some of the unset StructoLite as well.
Touch up veneer plaster painting full#
A couple heaping hands full of that to the 50$ bag of SL will assure it sets. Land plaster is a bit more user friendly and relatively cheap. Grind up a couple heaping hands full and add that to the mix.
Or another way you can get it is to pulverize some of the very plaster you tore off the wall. There is is sometimes called land plaster. There are two convenient sources of raw gypsum. If you have to do any more of this and if you choose to use StructoLite you should add a gallon or so of plaster sand to a 50# bag of StructoLite In addition you should add some raw gypsum. In your case I suspect it didn't set at all. StructoLite is a good material but it is notorious for setting slowly.
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