I was airbrushing some 4:1 thinned Italeri flat clear acrylic paint on a model not too long ago. When it dried I found white splotches on all the large surfaces of the model. I glossed over it again and sprayed it again, this time thinned 2:1. It still did it but the spots weren’t as visible. I did more flat coat after that. I’m wondering what the proper formula for thinning Italeri’s paint is.