If you want it to stay chrome, then do the weathering with something that requires no sealer, such as paint. If you chalk it, you’re other going to have to seal it, which will change the finish no matter what, or live with the fact that over time, the chalk work could come off with handling (or just don’t handle it). If you gloss cote weathering, it’s going to look like it just got rained on… probably not the effect you’re after. You can mix chalk into the paint so that the paint has some texture to it, and obviously it’ll dry in place with the paint.
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