Holmenkol SealnGlide was the product.
I searched for it recently and was eventually informed by Holmenkol that they unfortunately no longer produce it. Huge loss! While it was spendy, it was the best thing out there.
SailKote does a pretty good job at least, but is a slower application for small sails. I recommend using the liquid versus aerosol product. It goes longer and makes for better coverage. And is far more economical in the long run.