"Stevenson odorless mineral spirit which is paraffin based"
What the UK calls paraffin, the US used to "paraffin oil" but now calls "kerosene". The top grade, water-white kerosene for indoor heaters and the like, might cost 1/3 of that in a US store. Art supply stores...I remember what I used to pay for some of the brand names there. What can you do, that's a convenience tax. Must be doubly so when it all has to be shipped in by ocean or air freight.
Isopar L is an ExxonMobil product, apparently similar to kerosene:
Isopar™ L Fluid - ExxonMobil
"Isopar™ L Fluid is characterized as a synthetic isoparaffinic hydrocarbon solvent ... Isopar L Fluid is a liquid solvent used in paints and coatings, consumer"
Of course, now you can decant off the extra two pints and sell them to other sailors in the same situation. (VBG)