Must not have gotten enough clear flat coverage there. Looks pretty good as weathering there, actually.

Yep, with no flat clear to protect it the thinner in the MM probably lifted the primer and took the paint with it.

Are you using the MM lacquer or acrylic flat coat?

Yes that is what I meant...I have used that very same product(acrylic)for many
years and never had that kind of reaction.

Did you use it straight or thinned?...if thinned, what thinner did you use?

Yes, that is weird that you got that reaction.
Can't think why that should happen.
Cheers,

Well, it's not completely correct. But the reason to switch to a flat clear is this. You want your filters to stay where you put them, and panel lines have a capillary action of their own.

You're welcome Dan, and welcome to Armorama!

In my experience, oils are vastly superior to acrylics for weathering. The long drying time of oils is an advantage in weathering. With experience you will learn how to use that time to apply an oil effect, then come back to it and shift it, add to it, remove some, add a little of another color, etc. Oils also have a blendability and flexability, a nuance, that you just don't get with any other medium. They are also extremely economical. One tube will last you decades. You can make every different effect from the same tube, each as thin or as thick as you want.
Be careful with Vallejo washes. I had some once and used the Dark Green for a general wash over a clear coat. It turned the whole model dark green and wouldn't come off. I had to strip the model and start over. I no longer have the Vallejo washes and only use oils for weathering.

Hi Dan,
You can put decals over a gloss or matt paint as long as the surface is smooth.

Cheers Rob.