When applying UV Gel Nail extensions I can never do them so that you can't see the seam.?

I don't like wearing coloured varnish to hide it. Any tips?When applying UV Gel Nail extensions I can never do them so that you can't see the seam.?
File the nail flat before using the uv.Thats what i do and it works perfect.When applying UV Gel Nail extensions I can never do them so that you can't see the seam.?
I thought you took the gel right up to the cuticle - hence no need to hide seam. Otherwise buff the seam until its gone.