The only paint sealant I have used which I swear by is Permaplate. Only available through dealers. They apply this on new and pre-owned vehicles and warranty it if done by a recognized dealer. However, I am curious as to how the 3m works. The Permaplate has a two step process which consists of sealer and then renewer.
thanks for the tip as I have run low on my supply and can't acquire any more since I left the commercial industry.