seems like the demand exceeded the supply,but I remember hearing about some shipment being delayed in ports a couple months ago,many online hobby stores are out of a lot of Mr hobby primers/bottles or cans and all types of their thinners,..I bought about 4 big bottles of the stuff about a year ago so I would not be stuck in the future,if you go to a auto paint store and ask for slower drying thinner (different temps that body shops paint in) you can get the same stuff as Mr hobby levelling thinner its just slow,medium,fast drying thinner