I'm curious if anyone's actually gotten anything out of 3M's warranty
we had issues a few years back and they pointed out the fine print that basically hung us out to dry. I still have faith in both products and don't forsee a need to stick to warranty guidelines, given that they will most likely find a way to blame you in the end.
i find no reason to buy an entire roll of 3M overlam if you've got enough leftover from your Oracal roll to complete the project, or vice versa. Just make sure you take notes, in case you have to match anything down the line.
DO NOT MIX CALENDARED PRODUCTS! i've done so in the past for freebie coroplast signs and worked great for what they were for..... buuuut after a few months sitting in the scrap pile, i've noticed delamination from the two different materials shrinking against each other.