Hello ,,, I am wanting to know what would you think would be a good substrate for inside of factory to put on columns. It will have black reflective vinyl on it. It is for First Responers for location purposes. The columns are about 10" wide & will have lettering 6" tall (example A!,,B2..W4) I need something stronger than coroplast. It will be mounted with double sided tape (like bugar tape) Thanks for any thoughts.