Krylon fusion and similar products are designed to adhere to plastics better, don't need primer, and have an enamel hardness that stands up better to "play" than model paints, without needing to add a top coat. It's great for us unskilled quasi-hobbyists.
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I wholeheartedly disagree.
Fusion paint is by far the worst paint I have ever used. It does not do what it is advertised to do. It rubs off very easily. Unless you clear coat it you will regret it.
If you sand your Valk and leave it just a slight bit rough...any paint should stick to it very well without primer.
I recommend DUPLICOLOR engine paints.