I've tried the double melt method, perhaps you're using a thicker walled basket than I had. Within a few trips they worked loose and once they started to tip over they caused knots.
I've also tried going to thin refrigerator tubing, more melt material and the same occurred over time.
If they hold up I would say you've done well.
Marine goop holds, but it has an odor even after a couple of weeks.
Aquaseal will hold anything and no odor, just a hefty price.