What? Oh God no! Sure maybe for those non-
dna ones. As those boards doesn't have a protective coating while DNA ones does. The DNA doesn't coat the switches or the external wire connections for obvious reasons. So there is very little worry even if
juice does someday just gets in there.
Now some people are super freaked out and go through the process of sealing virtually everything. Sure, if you want to bother, go knock yourself out. But I have four of them and I never did a thing to them. Three of them never had a single leak ever. Condensation was a problem in the beginning and I bought all of those plugs and stuff. But you don't need them and frankly, they kind of make the back of the
tank wetter. What worked fabulous was those
JMK tips. Now everything is now virtually bone dry stock. But you don't need them really either.
Now the one that constantly leaked, something was wrong with the tank. It was tight as a drum and then in the middle of the night, it would unload 5ml of juice all over the place. BB was soaked in juice. Wiped everything down (I didn't take it apart or anything) and worked like a champ. Happened about 10 more times before I kicked that tank to the curb. No problems since. That BB never quit working even after all of those leaks.