Your body will adapt over time, so that sweating will be less troublesome. It never fully goes away, though.
In my case, if I have a day when I'm mostly in my office and not very active physically, sweating is no longer even an issue. If I'm out in the plant, working in some of the areas where the temperature is high or doing a lot of physical work, then I will still sweat significantly under my brief, but it's not as bothersome as it used to be. I've had a few occasions where I've had a dry day (about a third of my days are dry), but when I take my brief off after an active, hot day, it's nearly as heavy as after an accident.
I haven't found any products that are particularly helpful. I used to use some unscented powder to help absorb sweat, but it didn't really help much with keeping things comfortable so I will using it. The biggest thing I've done is to find a brief that doesn't clump or disintegrate when it absorbs sweat, which helps about the discomfort of sitting on hard lumps of padding, or having the padding fall apart and shift around so that the brief won't absorb properly if I have an accident. Many of the premium briefs from various manufacturers are decent in this regard, but you may have to try some different ones to find what works best for you.
I do keep some cloth-backed diapers on hand to wear with I'm working out. They're more breathable than the plastic-backed ones, but they don't work well for me for regular use - they tend to say basket after a few hours, which can lead to leakage, and when I need to walk a lot they will chafe me raw on the inside of my thighs and in the crease between my legs and torso.