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Sun method is one day, I think it took about 1 hr total when I did it. just set it out with the face up, let it get warmed up (about 30 min on a hot florida day), insert wedges (chop sticks for me) around the perimeter, tap them in until just snug, walk away for 10 min, check them, tap in some more until snug, repeat. You can see what looks like fissures developing in the pva as it starts to release, at 1st its uneven (some sticks will snug up more that others), but as it progresses you will see a perfect circle form (the remaining contact point), and it will accelarate as it progresses. the main thing is to not over do the snug process, you just tap them in until "just" snug, not trying to pry it off, just apply even pressure. I had them about every inch around the perimeter.
I also preceded this by soaking the face of the tube (and the pva) in a small kidde pool for about 1 month in tap water. this softend up the rock hard pva a lot. I was able to then pick out about 1-2 inches of the pva around the edges, providing a space to insert the chop stick wedges.
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