I read on here that the free edge should be roughly the thickness of one credit card and the thickness at the apex roughly two credit cards.
So I take a credit with me as a guide. I was doing my acrylics way to thin and my clients were breaking them all the time. Since using my credit Card they have hardly broken any.
Obviously when applying tips the more you blend the thinner the free edge. Credit card thickness applies to the acrylic not the tip. Again I thought it applied to the acrylic and the tip another reason why mine were breaking. In order to get a sleek look blend the tip as thin as possible. The tip is not there for strength it is only a guide. Better still have a go at sculpting that way your enhancement look super thin but super strong. Just make sure you build up the apex well.
Also you need to press the product down really well which ensures the zones all mesh together which adds strength and aids thinness.
I was too scared to press the product down so I was getting loads of lifting and working far to dry so the zones weren't sort of joining together iygwim.
I haven't been doing nails very long but these are all tips I have picked up on Salongeek.
Lastly Geeg once told me everyone is different and you have to treat each client as an individual. I've got ladies with 7 horses so they can't have these super thin enhancements they just don't last. I don't mean doing house bricks, but yes they need a slightly thicker free edge. They don't mind at all. Rather that than them breaking them all the time and doing loads of damage to their natural nails. Plus all the time to keep repairing.
Good luck ladies.