Don't worry about the crust. While the gel is wet the testosterone is being absorbed and as far as I understand once it dries, that's it. Some gels are rubbed some are spread. The Besins gels are designed to be spread and gels like Testim and Sandrena, rubbed - this is due to the different fillers. If you read the official spc for testogel it says this: "The gel has just to be simply spread on the skin gently as a thin layer. It is not necessary to rub it on the skin. Allow drying for at least 3-5 minutes before dressing. " Some women also try rubbing in the gel but because it is more watery this doesn't necessarily work so well.
Hurdity x