You should avoid lamination as it could be counterproductive and result in speeding up the degradation process.
Any proof on that? I have Comix F9061 A4 Laminator, laminated my paperwallet back in 2014 and it is in the perfect state at the moment, no blurs at all. Lamination is better that the bare piece of paper. Sure one could put it into vacuum (or at least filled with inert gas) container to preserve but it would be it would only be justified for the astronomicalу large funds.