Tamiya.
First, don't use
Tamiya paints on figures; they don't work with a brush. Get some ModelMaster, PollyScale or Andrea/Vallejo. Go online if you have to. It's absolutely worth it. Not only will you get better quality paint, you'll have a much wider choice of colors.
Next,
Tamiya flat. The stuff should come with a big red letter warning not to use this OVER paints. It's not a product to be painted over something like ANY other clear flat. You're supposed to mix it into paint BEFORE you apply it.
I said this before and I'm saying it again, what is wrong with
Tamiya to keep marketing this
garbage? Further, the clerks in the stores should be advising people how to use this.
Hopefully, you can safely strip your figure back to clean plastic and start over. If not, consider it a
lesson in why so many of us hate
Tamiya paint.