I have both a metal empire
mods shield and an avid vapor delrin (I think...It's some kind of plastic.) drip shield and they both work fine. No need to avoid the delrin.
A shield alone isn't enough to allow dripping and driving IMO. The cadillac for that is the
Vapemate from Super T but, they are pricey so I don't own one. Another option is the
Drip On Demand Kit. I do have one of those and it works well for no look dripping. There is also
The Dripper. I've seen some posts that say it works. However, just a shield alone won't make dripping and driving safe.