I've used it for years on my keeper signs, it works best on cobalt blue. The color will stay as long as you want, you can wash the sign but it doesn't go right back to "faded blue", it does retain some luster.
There is nothing sneaky about it, you can feel the greasyness of it.

Last edited by KZ1000; Fri May 01 2020 04:45 PM.

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