I need to make L plates (it is used for learner motorcycle riders in many countries) at home.
Previously, I made it using a thick 250 gsm paper. I got L printed on it. But with time it faded and when I washed my bike, it got ruined. The color and paper became useless.
Then I found another solution to fix the color problem. I didn't print it this time. I got a red colored tape. And pasted it on the paper. It solved the color problem.
But still the paper is not waterproof and I need slightly more thick board. Something like 300 gsm would be perfect.
Here's an example of what I would need: https://youtu.be/YYi_ZqrJycA?t=48
In this video, you can see the board is thick and I feel it's not some cardboard. So it is most probably waterproof too. He tried to twist it. It was very flexible.
I want material like that. I could not find it online. Maybe I don't know exactly what to search for.
The closest material I found out was this - made from some PVC material. But it is very small. I need at least 18 x 18 cm.
So are there any other alternative material or solution to make this kind of board/plate?