I've purchased this a few times over the years. In Summer I am a sweaty mess and someone recommended it to me. My main problem area is my top lip, it's so annoying and makes me feel very uncomfortable.
I find the cheapest place to by from is the Chemist Warehouse. It comes a 50g squeezy tube, really easy to squeeze out a small amount. It is a thick, clear gel.
I only apply to my problem areas, a little bit definitely goes a long way. If you apply too much it stays sticky and feels really horrible.
For me I found this works quite well. It gives me a weird feeling though, it feels like I'm sweating but there is nothing there. On really hot days there is definitely some sweat coming through. I recommend to give it a go if you have sweaty face issues that are bothering you.
I unfortunately suffer from excessive sweating on my face during the humid months, I have searched and searched for something to relieve this and have tried this product. It did definately relieve the sweating but did not totally eliminate it. It is a nice lightweight gel that does have a matte finish, and is perfectly fine under makeup. The reason I have given it 3 stars is I think that for the average sweater it would work absolutely fine but if you do suffer from excessive sweating it does not totally block it. Although something is better than nothing right!
Tips: Wait 5 minutes after applying before you apply makeup so it is totally absorbed. Ive also been told to apply products like this at night and then again in the morning.