>>10793038Well it's hard to say exactly but it is likely to do with thickness/drying time/surface tension. Here's a funny issue that's not exactly the same but caused by surface tension with two paints you'd think were compatible (Vallejo and MIG which are both latex based acrylics), luckily I discovered this when I was working out what way to paint a model so it ended up on the tester spoons and not 2 months of work