The trick to a good prosthetic application is the edges... if you cant see them the better the makeup. Visible edges puts the fake back into the overall look.
BodyFX has created a unique formula which helps "melt' away those thin edges on a foam latex piece.
Once you have applied the piece, brush onto the thin edges to melt them into the skin. For thicker edges you can use Pros-Aide cream or FX Paste.