I'm used to painting laser-cut acrylic letters for interior signs, but this time a customer asked me for letters that will go on an exterior sign.

Would a water-based paint on acrylic stand the test of outside weather??

Or maybe acrylic is not a good choice of material... I am actually looking for a material that would have 1/4'' thickness, and be paintable. I ruled out MDF because it absorbs water like a sponge. Sintra would have been nice but it's PVC, therefore not laserable. Signfoam is too thick for my needs.

It seems so basic a task, but I can't seem to get the info I need. When googling for "painting acrylic", I get all the pages about acrylic paint... it's tricky!

Thanks in advance,