yeah man I went with the liquid electrical tape for the main chip body and epoxy on the switches and a clear acrylic coating for the display. as far as the tact switches, I find that they are fairly resilient to water damage but yeah they're not going to last forever submerging them all the time, on my metal grand I used a tact switch for the fire button and that's in the head right next to the atty, can't tell you how many times I've gotten juice all over it and even flushed it with water in the sink many times when it would get really gunked up with juice and start to get sticky when pressing it, it's still going fine but I do know there not really waterproof so for this test I just dabbed a little vaseline around the switches to keep water out. I did do this in a way that I can replace the tact switches alone so I'm not so concerned with the switches and I really don't intend on submerging this thing on a regular basis either so the switches should last a few years at least.
I've seen plenty of chips go bad and just about every one that I have seen go bad are from one thing and one thing only, juice damage... if the chip is kept nice and dry it should last years and years. it doesn't take a lot of juice to do damage too, even trace amounts can kill a chip, juice can even wick to the chip from the wires and it's extremely difficult to keep a chip in a bf dry at all times. this one now won't be damaged by juice so it should last a really long time, I expect years but if I ever need to swap out the chip I can do that too without ruining the mod so I think I'm good here
the mosfet on the dna doesn't really get hot, nothing on the board really gets hot and I have had no problems. I even torture tested this by repeatedly firing at 30 watts with a fresh battery, over and over until I killed the battery and I had to keep dunking the atty so I don't start to melt the insulator and it passed with flying colors, no hint of heat buildup at all. I didn't video that because it would have really been a long boring video there but I torture tested it at way more repeated loads than you could ever chain vape at max watts and no problems at all
