I initially planned on mounting a selection of tiles to plexi with white glue. What a mess! Two days of bull docking around got me no where with the white.
I ran down to CVS for some old school rubber glue. The shit your mates were sniffing in 8th grade. It will get ya high, but attaches roads to plexi like it was its sole job.
Mold release. There is nothing worse than digging your master out of rubber. Two light coats and one high with an after brushing.
I also use an unconventional tool. I hold a vibrating dick to the outside of the blocks and rub it along the plexi. I believe this helps the bubbles float to the top.
After curing for 20 hours. De-mold time. It need some cleaning up, but I am very happy.
I will have to make at least two more molds. Than I should be able to pour out enough roads to cover two GW realms of battle boards. Plus do some interesting cuts and angles with the roads throughout the city.