Valentina,
I decided to try the top molds. I like the square shape when building up, because it creates an apex right away, and I don't need to add material after removing the molds. Sawing off is minimal, it's very easy to adjust parallels with a file, in the cuticle zone a fissure cutter is enough, I saw out the material from inside if I put too much and that's it! No agony, salon square arch nails ready, without much difficulty. Not convenient seemed in the extension of the short almond, as the nail turns out to be upturned in the