Once the glue is set and the piece stays in place you can remove your hand.
Best glue for tail light lens.
A very thing bead of it after cleaning the crack with some rubbing alcohol and you probably wont even be able to see it.
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If the tail light was removed to dry the inside then the tail light will now be reinstalled.
How to glue a tail light lens.
If you use clear turn or parking lite lens you will have clear glue.
Install the tail light.
Lens repair headlight tail light.
Check for fitment and secure all bolts.
Vinyl leather repair.
Pull out the tail light assembly and remove the bulbs by twisting them out of the sockets with your hands.
Yours i would get some good super glue i buy the little tubes of gorilla glue super glue.
A c gasket and seals.
Take an old plastic lens or a broken lens and put the pieces in a jar with some acetone.
It will melt the plastic and you will have red colored glue.
The more plastic you melt in the acetone the thicker the glue will be.
Remove the tail light lens using the phillips head screwdriver.