Cracks in primer!! Help!

Hi,

Etched and high build primed the Land rover over the last 2 weekends.

First weekend, sanded right back to factory paint and bare metal for repairs. Filled sanded etc then properly cleaned and de-greased. Etched primed and then left it over the week. Cracks formed in some areas - mainly corners near the tub capping and as shown in the picture below.

I sanded the cracks back and continued to high build (none of the cracks on bare metal).

High built was sprayed and looked good but then cracks appear in the same places!

Anyone know why and what i can do to fix?



Thanks

Flat back down and put some stopper in the cracks, sand smooth and more high build.
What thinners are you using ???

Was taking a short cut and using ready to spray

https://www.ebay.co.uk/itm/CELLULOS...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

will sand it back and reprime

Dont spray too heavy. Dust on, allow time to flash then more dust coats.

You say you flatted to original paint, what was the paint that you sanded back ?

The CELLULOSE could be causing the problem.