I generally use insulation tape anywhere I think there could be an issue but that liquid tape looks like a real winner. I've also started using sticky back Velcro on the backs of the pots and gluing the other side to the board to help keep it in place, this really seems to help keep things secure. For LEDs, the
chrome fitting from Tayda come with a plug that helps keep them secure or
Bitsbox sell some really cheap black bezels that have a clip at the back to keep the LED secure, I've never had one come loose yet. I also use some heatshrink tubing to seal the solder joints of the LED if I'm feeling like going the extra mile, eg. a pressent for a friend, I don't usually bother if it's for me as I don't play any gigs so they're not getting much of a battering.