How's it going Marhen, there are two I would try: Triflow and Hammerite. They can be a bit pricey but are longer lasting than a spray paint because they form a thicker coat. I would suggest painting with a sponge roller, they are often used for applying varnish. I find that heating the object to be painted a little first with a hot air gun, it drives moisture off the object and helps the paint to adhere better. Hope this helps and good luck with it!
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