Would this work?

Can anyone tell me if this colloidal silver throat(30 ppm) by Source Naturals would work, or should I use something else
to breed with? Oh also, for autoflowers how late is to late to start spraying? Supposedly 8wk auto, really don't know, my first auto Fast & Vast by Heavyweight.
Thanks in advance.

Make your own. Pure silver is cheap and you can get it on ebay. All you need is the silver, some distilled water and a 9v battery to make it.

How late is to late to start spraying with cs that has a 8weeks from germination to harvest?

Also I forgot to ask, does the lights have to be off when applying cs? Thanks in advance.

i would think you would need 2-3 weeks to produce pollen, but i have never used it on an auto ( i plan too) , but i have also always started applying the C.S. before flowering and continued it for 2 weeks into flower