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Didn't know 'bout the Plaster of Paris thing. Fortunately the toilet sits good and solid.
We're gonna redo our bathroom floor and I might just get a proper flange repair kit when we pull the toilet.
ALWAYS use Plaster of Paris just prior to setting the toilet down. Not only do you get an air tight seal, but more importantly the toilet will NEVER rock, move, or put uneven stress on the Johnny Bolts.
Take the toilet and dry fit it. Trace with a pencil around the perimeter of the bowl so you know exactly where to put plaster. When you have everything in place and are ready to rock, mix up Paster of Paris (you need to work relatively quickly as the plaster dries fast) dab all around the inside of the pencil line and place toilet on top. After tightening the Johnny Bolts, use your finger to remove and smooth out the Plaster that protrudes from the fixture to leave a nice even bead. Not only will you have a perfectly seated toilet that wont rock, move or shift but you will also seal the toilet from water going underneath when you mop the floor. Sounds complicated but in reality it's very easy!