What is the best glue/adhesive for adhering plastic to metal?

3M has a double sided tape that's used for automotive decals etc. It should work for you! :)

Georgia....Try E6000...it just might work! Good luck

E-6100, with all the strength and adhesive properties of E-6000, is the thicker non-sag formulation that won't slump or run, allowing for maximum control. This translucent-clear adhesive is ideal for overhead and vertical use.

Georgia: I like the GEL Super Glue by Gorilla... I have used it on metal for metal reflectors!

Hi ! Use E6000 ! It is a great heavy duty glue ! You can find it in craft stores , Wal-Mart., even some grocery stores .

Cyanoacrylate (Super Glue).

I would use 2-oart epoxy glue for an exterior project, It comes in 2 syringes for the 2 parts, and mix on a piece of cardboard with a popsicle stick or a chop stick, then apply to the back of the reflector. Put some painters tape over it once stuck to the mailbox to give it time to cure.

This glue works well for metal/plastic: https://amzn.to/36y1Ga8

Hope this Helps! Jeremy - https://do-daddy.com

Home Depot sells reflector tape just peel and stick

How about putting a magnet on it

I use E6000 on everything. It holds very well.