Using colloidial silver

Hello everyone I would like to know if I use CS on a single plant branch and pollinate that same plant with it's own pollen how close will the seeds be to the original? I have done this before but about to spray my Hawaiian snow to preserve its genetics in seed form for the next few years. Thank you for helping.

Spray and pray!

You are better off keeping the pollen for use later. Selfing is hard.

I have selfed a mexican sativa before and it worked great but have not tested the seeds. Is this a bad idea? I will take clones this time before I spray to be sure. I just don't want to loose this one seed because they are hard for me to get. Thanks guys