How should I fix a small crack hole in Mirolin 3-piece tub/shower?
Depending on where the crack/hole is, I would wonder about the support underneath the acrylic of the tub. Was the crack/hole caused by some part of the tub that was not supported getting flexed too much under regular use? If so, then I might doubt the repair kit myself. However, if the crack/hole was just due to some sharp object hitting the tub, then I suppose it will work fine. However, if it is a support issue, you might as well try the repair kit, because your other alternative is pulling the whole thing out to try to fix the lack of support, which sounds like a huge job. Just my $0.02 worth.
Hope this helps.