Re: Rust discovered on back hatch on my 2014 Terrain!!!!
Talk to the dealer in this case. This is a common problem that has been fixed.
It seems the chrome trim piece that is above the license plate needs a gasket or pad of sorts between it and the painted body. In some cases it was not installed on or the chrome piece had a bit of curl or warp on it's corners which dings the paint till bare metal is made. Then the elements take their toll.
GMC has been fixing this for customers and installing the proper "gasket" or separator.
2019 GMC Acadia SLT-1 3.6L LGX V6 - Build Date: 4-11-2019 - Bought 6-22-2019
SOLD - - 2015 Equinox LTZ 3.6L FWD Champagne Silver Metallic *Build Date 1-08-2015 *
SOLD with *38,865 miles 8-15-2019.