I use envirotex epoxy. It’s pretty bullet proof once you get past the drilling. It’s definitely not for everyone. There’s a serious learning curve when it comes to drilling out your holes. It takes the patience of a saint and quite a few fails but once you’ve got it it becomes surprisingly easy.So far I've been using this, and it never fully hardens, so laying a cable on an enclosure weeks after spraying will still leave impressions in the clear. Unacceptable.
I'm doing inkjet waterslide decals for my art and need a sturdy clear. I welcome your suggestions!