Pics are not showing up for me.
Depending on what year your truck is - you don't have bad clearcoat. Square bodies were high solid enamel paint (single stage) until up to the very last. Probably a delamination of the top coat (color).
Base coat/clear coat was introduced on squares around the 1988 model year.
Post a copy of the SPID label and we can tell which paint scheme was original (ZY5, for example) and what the codes are (ie, 66U Indian Bronze Metallic and 61L Doeskin Tan).
https://www.gmheritagecenter.com/doc...olet-Truck.pdf
K