For starters, try to mix only the amount of plaster you will use as it will start to set up.
As for getting rid of the excess, scrape it out of the bucket before it sets up and place it in plastic lined garbage can and toss it.
The small amount that’s left in the bucket can be flushed with a hose outside.
How do you dispose of plaster of Paris water?
Reuse of uncontaminated plaster of Paris can be accomplished by breaking the set plaster into small pieces, placing it in an old roasting pan and reheating it to its melting point — 325 degrees Fahrenheit — to remove water (See References 8). When the material can easily be crushed into powder it is ready for reuse.
How do I dispose of plaster?
Because they contain high levels of sulphate, you must separate plaster, plasterboard and other gypsum products from your general wastes. You must dispose of non-hazardous gypsum-based materials in landfills for non-hazardous waste, in cells where there is no biodegradable waste.
Can you pour plaster of Paris down the sink?
Throwing plaster of Paris down the drain can clog it. The easiest way to clean the bowl is to let it dry and squeeze it to make the crumbs fall in the trash. But I used a wet sponge to “sand” my mess (wonderful!) and ended up with white water mixed with plaster.
How do you dispose of drywall mud?
Put it in a larger trash bag with household trash. Dispose of it over a few weeks. Or, meet the trash men in the morning to see if you can just throw the entire bucket in the trash.