Best coating for an etchant resist?

It took a while but it finally went full dark. It was weird how it progressed. I used the solution at full strenght. From the beginning it started blackening from the left end and crept a little further to the right after every application, except for the P. For some reason it didn't go black until a couple hours ago. I do see a small irregularity in the bottom of that letter so I'm going to etch the snot out of it just in case there is a grinder mark that runs over the logo and I have to do some sanding on it to get them out
 
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