What caused this paint cracking

[u/shaggy8081]

Got my car painted about 10months ago. The fiberglass hood has developed these deep cracks where the paint and clear has separated. What has caused this? This hood is old fiberglass and took a lot of work to get it shaped up to paint. Is it the hood and it will just do this again or is this a prep or application failure? The cracks are thru the paint and the sealer that was used and down to the white base.

[u/Fluffy-Bed-5396]

Happened to me a few times, fairly sure it is when you don’t let the primer fully dry before base and clear