Are you sure you're using a real blacklight? Not the crummy ones, not the newer LEDs? For the ultimate glowy effect, the old school florescent lights (either the long tubes -shop light looking ones or the curly/U shaped compact versions) will work best. I know the LEDs have improved greatly in the last 5ish years, but they're still more glowy but mostly turn things kinda purple than the OG florescent tubes where you only see darkness and UV GLOW.
If you really want webbing - and one that will glow beautifully under UV, you should probably spray it with reactive paint/liquids. Some of the web in the bag stuff claims to be glow in the dark, but it's pretty weak sauce.
Webcasting guns use glue sticks and there are glow in the dark glue sticks. It's more involved and if you do it outside, it will get easily destroyed by any weather stuff, but just throwing that out there as an option if you have a covered/protected space and wanted to look into it.
Also may want to check out beef netting. There's plenty of threads on here (most folks mention ordering from trenton mills) and a few different techniques, but mostly, it's a streeeeeechy cheesecloth type of fabric that if you get a cotton blend, can be soaked in a UV reactive liquid of some type (seems the best recommendation is for Rit whitener) and then dried out and then put it up and cut holes into and stretch it to get the effect you're going for.
And while I know you said how to get it to glow without spraying it, but consider the Rit whitener in a spraybottle if you're really disappointed with the glow effect. May take a bit of effort/time to get things covered, but the effect might be worth the extra effort.
www.halloweenforum.com
If you really want webbing - and one that will glow beautifully under UV, you should probably spray it with reactive paint/liquids. Some of the web in the bag stuff claims to be glow in the dark, but it's pretty weak sauce.
Webcasting guns use glue sticks and there are glow in the dark glue sticks. It's more involved and if you do it outside, it will get easily destroyed by any weather stuff, but just throwing that out there as an option if you have a covered/protected space and wanted to look into it.
Also may want to check out beef netting. There's plenty of threads on here (most folks mention ordering from trenton mills) and a few different techniques, but mostly, it's a streeeeeechy cheesecloth type of fabric that if you get a cotton blend, can be soaked in a UV reactive liquid of some type (seems the best recommendation is for Rit whitener) and then dried out and then put it up and cut holes into and stretch it to get the effect you're going for.
And while I know you said how to get it to glow without spraying it, but consider the Rit whitener in a spraybottle if you're really disappointed with the glow effect. May take a bit of effort/time to get things covered, but the effect might be worth the extra effort.

Beef Netting - glow in the dark?
What do you use to whiten beef netting so it glows in the dark?