The biggest issue that I have with sweating is not the bond loosening, it is that the system hair will stay dry while the side hair & back hair is sopping wet. This can look odd, there are workarounds like spritzing your system hair with water or using a "wet look" gel. Lately I've been wearing my hair very short on sides and back, this seems to be less of an issue. The short hair doesn't look much different when wet, unlike longer hair.

You do need to be cool and dry while attaching, if you're sweating the glues and tapes won't stick well. IMO blue lace tape will hold through anything, it can be a pain to clean if left on past 2 - 3 days. ST30 works as well for some who say it also is easier to clean up.