Test day:
So I'll begin by saying Im not super happy with the paint, and the scale of things needs to change a little bit because of the limitations of the laser. I do feel that the concept is pretty viable, with some changes, which I will detail later.
The material I used was Rowmark Lasermark in Gold with black substrate. My prep was to cover the gold surface with transfer tape, this is used in vinyl plotting to move vinyl off the backer, but I used it because its basically thin, low tack masking tape available in sizes up to like 4 feet wide, I went with the 6" roll. I also used masking tape to lock in the registration to the bed of the lasercutter.
I am using a 45 watt Epilog Legend 36EXT
I began by rastering the field that was to become blue.
My raster settings for the entire project are:
1200 DPI
Speed 40
Power 30
5000Hz
I then cut out the entire piece, making sure to not move the offcut, this is so the registration for the red field stays correct.
Cut settings were:
1200 DPI
Speed 40
Power 100
5000 Hz
After hitting the piece with blue paint I masked the surface again and taped the piece back into the previous cutout and rastered the red area.
Here is the result of today's experiment.
Things I will do differently in future experimentation, use a more aggressive masking tape, the transfer tape came away to easily, when cleaning up the sooty residue the tape came right off. Using a little brush to remove as much residue as possible, on a part so small and so detailed it really hindered the paint adhesion. Use primer, as the paint sloughed off some areas of the rastered surface. Use an airbrush instead of a rattle can, smaller atomization of paint would be beneficial. Change artwork to counteract some of the issues with the laser, ie: make the stars bigger, as they are about half the drawn size. Also the part cupped towards the laser, I think I could counteract this by doing an initial cutout about 1/4 " outside the actual cutout, and taking a few lighter passes on the rastering instead of doing it all in one go, also letting the material cool for a minute between rastering and cutting out.
All that being said, for a half hour of fiddling around on my lunch break..... not too bad IMHO.