I'm making some ground tiles out of showerboard, so we can use dry erase markers on it.
I need to lay down a 1 inch by 1 inch grid on it.
I' thought about using auto-pinstriping. In the past I used a ruler, a blade and clamps to make cuts, but every so often I'd lose control and make a mark on the board, plus, it was very labor intensive.
Any ideas or tools that I could use to lay down a permanent grid? ( I'm tried ink pens, the ink never stays). I'd really prefer grooves. Each tile is about a foot by a foot in size.
Thanks for any ideas.
( and no, I don't want to use a mat with wet erase markers. I prefer the boards).