Added first and 2nd coats of primer. The first coat was a cheap automotive spray can primer. Went on uniformly but needed heavy sanding to smooth out the rough texture. Although it didn't produce a paint-ready surface, it did a good job of filling in sanding marks and other marks in the resin that I couldn't see prior to priming. This was the first time I'd used el cheapo primer and I will probably continue doing so since it filled well and was cheap. For the hoped-for final layer, I used Gunze Sangyo Mr. Finisher 1000. Looked brilliant when wet, but after drying I could see sanding marks and gaps in the putty that need further clean up. A bit disappointing that it needs more work, but I'd rather see the flaws before the Zero paint goes on.
Photos show the results of the GS primer. Well, they intend to show it but all of our digital cameras are broken except for one - and it sucks. They ain't much, but you can at least see some of the cleanup that needs to occur.