Nanook

I have three gopro 3+blacks never used..I may have a track day on Monday and today purchased gopro suction mounts..are they reliable enough to trust they will stay stuck to the outside fender/glass etc..do you need to back up with a tether of sorts ? Any particular tricks ? Moisten cups or not ?
tia

whatcop?

Don't moisten and make sure the surface is clean and dry. Remember to start and stop the cameras. They won't go anywhere.

Nanook

VG thanks !!

phipp85

Stick it to a relatively flat surface. I clean the area and the suction cup with a little bit of glass cleaner.

Andy66FL

although this wasn't really part of the question:
I would also recommend the GoPro-App (available for most smartphones)
You can have a livestream (to check the camera's direction)
and you (or your co-driver) can control the camera via the app

Nanook

Have but won't control more than one camera I don't think