Sorry for digging out this thread, but I followed the guide on priming with gesso, as my current living situation makes it hard for me to spray-prime.
I ran into a small problem. The paint and underlying gesso scratch off very easily. I used the Liquitex Black Gesso, not thinned down.
I tried it on metal, resin and GW plastic. Same result on all. Easy to scratch off.
Any help?
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