I just finished up using SEM trim black on fiberglass backlight louvers which has just the dull satin look I wanted.
I did have a very minor glitch in that if you look very, very closely you can pick out a few "spider webs" I guess you would call them.
I sanded them away (or at least i thought I did) but when I sprayed two additional coats they either came back or some new ones appeared. After all the hours and hours of hand sanding, i will probably be the only one who notices this almost invisible imperfection. I am very pleased overall (the SEM paint was over a year old).
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