First off, let me state that I always wash my kits before painting...
So this is very interesting... Been using Tamiya paints since they arrived on the market and never have had an issue. Lately the paint has failed me on two different kits. Very oddly, they are both Skyraiders and both colors are a light grey. The picture here is a Hasegawa 1/72 Skyraider and the paint is a custom mix of Tamiya XF acrylics. There is some serious adhesion issues going on. First the area in question started cracking like a dry lake bed, then paint started chipping off. That was several months ago. Fast forward to this month. I shot some Tamiya lacquer paint (LP) Insignia white on my Monogram A-1H I am building. A week later it starts cracking in a few areas and flaking off... What the flip? This is very discouraging and very unmotivating when you can no longer trust your paint. 
I may need to prime from now on.. I can't get over the fact that both issues came on Skyraiders 
, with relatively the same shade of paint , but one is Acrylic Tamiya and the other is Lacquer ...
No sense in showing the Monogram kit as I already brushed over the affected areas with Tamiya White Surfacer.. .but here with what the Hasegawa kit looks like...
