I am "testing" a waterborne Poly Topcoat and the TDS says "Viscosity using Ford Cup #6 40 +/- 5" I have googled a conversion chart for a ford #6 to #4 and found nothing. I cant even find a place to buy a number 6 cup lol.

I did thin the product 10 percent and am able to spray beautifully with my 1.8 Fujispray, but i am just curious if there is a conversion chart?

Thanks..