All our lab testing has always indicated to us that lower viscosity formulas that “seem” to migrate further actually provide very little corrosion protection. There is a misconception that thinner is better in cavities. And we have thinner formulas (LV & XLV), so it's not about "the sale". Some people tell us that they use the Woolwax™ for the undercarriage and some thinner brand for the cavities because they think it creeps better. That’s just not accurate. The traditional Woolwax™ creeps and migrates just as well and leaves a thicker coating than a thinner formula. It may take us a bit longer to get there, but Woolwax™ will travel to all the same nooks and crannies and leave a much thicker surface build on the way. We cannot emphasize enough that it is not about the creeping. It is all about the thickness of the “surface build” that is protecting the base metal.
On enclosed areas "surface-build" is everything. Thin formulas will creep, and the surface build gets thinner and thinner all along the way as it "drops off" material until the coating is so thin, there is almost no surface-build to provide protection. This is an area where dirt, salt, and water can accumulate and sit idle. It requires a good thick surface- build to prevent the idle water/salt from reaching the metal frame.
We are not implying that creeping migration is completely insignificant. Migration is very helpful in areas where gravity is in your favor (downward). Viscous products (like Woolwax™) will achieve a significant downward drag (creep) leaving behind a thick coating in its trail.
Upward liquid flow migration (against gravity) is more limited and less effective. Upward migration of a low viscosity liquid can often be mistaken for protective coating, when it is nothing more than a thin layer “wet staining” that offers little to no corrosion protection .
Bottom line.... original thick Woolwax™ (or any viscous coating) will provide better protection for enclosed areas (frame rails, etc.) than thin formulas that leave a very fine surface-build that water/salt can penetrate easily.
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