Hiya marie,
Firslt ensure your form is well and truly snug to the underside of the free edge. If your nail form doesnt fit exact, it may be that you need to shape it a bit by cutting a bit out of it. Then apply in layers if you are doing french dont just put 1 bead on for zone 1. Use the clients free edge as a guide to creating their new smile line. I always round my clients free edge so that the form fits under more easily. Dont forget to "seal" your sides so you dont get lifting at the sidewall areas. Finally when i have finished each nail and the product has set somewhat i use my thumbs to pinch the sides to ensure a really nice c curve. Hope this helps.
Michelle