I’ve used Ben’s 100% deet before for field exercises. It melted the plastic casing of headlamp, but it works great. 30% does the same job to repel bugs you just have to re apply more often. We had no tents, it was 90F all night, and we were patrolling a lot day and night so having long lasting tick protection was great. If youre just doing yard work for a few hours, 30% deet is great.