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Originally Posted by Masterglass
I know delta does'nt agree but all resins have a percentage of shrinkage, so cure under pressure always.
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Actually, we do agree that resins shrink, but we disagree with your method of solving that.
When you apply pit resin to the break, don't push the curing tab with your thumb. What you want to do is create a mound of resin, which will then negate the problem with shrinkage.
Once it's cured, there is still a mound there, with an imperceptible amount that has filled in for the shrinkage problem. Then, simply scrape it flat and polish.