Hi Pat,
The ease afforded by the GG1 is in its lack of minute detail to work around when prepping for paint. I removed all PRR decoration by sparingly rubbing it with lacquer thinners on Q-tips. After a light scuff and a coat of Dupli-Color primer/sealer, any imperfections were sanded smooth with 1000 grit.
The shell was completely sprayed with Dupli-Color Perfect Match, Bright Silver Metallic. I try to lay on 2 wet coats without allowing the metallic to go blotchy or the paint to run. Ideally it's sprayed on a low humidity, room temperature day. Give the paint a good day to dry enough to continue with the next step, even though the paint will be taco free in 20 minutes.
I used SF, F3 decals, trimmed from the sheet, as templates to mark an approximate delineation in colors. The templates are then used to mark the masking tape when cutting it to conform to the contours of the warbonnet. I use high quality body shop 3M type 233+ tape. Again, I approximate the color separation and masking to delineate at center of the decal stripes. Wiggle room here is OK but lay the templates over the final masking to check positioning.
I suggest the second color be applied immediately after masking and remove the tape after drying for about 10 minutes. I chose Dupli-Color Torch Red, a GM color, and lay on a fine coat first and let dry five minutes. Then apply 2 wet coats to cover. Once the masking is removed let the job dry for an entire day, prefereably even longer. The paint solvents need to sufficiently gas off before continuing.
Carefully smooth any coarse ridges produced at the color separation with 1000 grit. Decal as usual with micro set and micro sol and next day the job will be ready to clear coat seal to your preference. I sprayed on a coat of gloss MinWax fast drying Varathane to finalize the job.
I pre-fitted the shell by drilling new mounting holes in the MTH chassis and shimmed to suit. After drilling out the solid holes in the truck sides the trucks and pilots received a generic semi-gloss silver ala SF practice. Grab irons got the silver treatment too only because I lacked the stainless wire at the time. The MTH pans fit perfectly into the existing William's holes. Replacement of the original PS1 with ERR control, sound and light was straight forward.
I'm certain there are steps I've forgotten. Coincidentally, I'm refinishing an old AB set of CLW, PA's in Santa Fe head dress currently...A project left in limbo until painting weather finally returned to Southern Ontario.
Bruce