Japanese Paint Sealant Advice

Sir Clean said:
.....with glass coating, rain water just rolls off the pain surface without leaving much of water spot. With waxed surface, there is always water spots after it rains.
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I agree that coatings exhibit impressive water-repellency or water-sheeting characteristics. That area could be a bit mis-leading.



If you shoot high pressure water onto the coated surface, water beads will "fly" all over and be gone very quickly. That's because the water has great velocity and pressure behind it. Simple tactic used in demos. Very impressive. Same applies to moderate and heavy rainfall.



But during a very light drizzle resulting in tiny droplets of water slowly settling on a stationary car, I hv never seen those water beads miraculously moving BY ITSELF (horror!) and skating off by itself, with no car movement and no wind at all.



Those so-called "self-cleaning ability" touted by coatings manufacturers....I take it with a pinch of salt. During a heavy rain with millions of high velocity droplets striking the paintwork, I agree it'll help to flow the dirt away. But on an already dirty car, during a light drizzle with millions of fine beads on top, how can there be a "self-cleaning" effect?
 
gigondaz said:
I agree that coatings exhibit impressive water-repellency or water-sheeting characteristics. That area could be a bit mis-leading.



If you shoot high pressure water onto the coated surface, water beads will "fly" all over and be gone very quickly. That's because the water has great velocity and pressure behind it. Simple tactic used in demos. Very impressive. Same applies to moderate and heavy rainfall.



But during a very light drizzle resulting in tiny droplets of water slowly settling on a stationary car, I hv never seen those water beads miraculously moving BY ITSELF (horror!) and skating off by itself, with no car movement and no wind at all.



Those so-called "self-cleaning ability" touted by coatings manufacturers....I take it with a pinch of salt. During a heavy rain with millions of high velocity droplets striking the paintwork, I agree it'll help to flow the dirt away. But on an already dirty car, during a light drizzle with millions of fine beads on top, how can there be a "self-cleaning" effect?
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I don't subscribe to this so-called self-cleaning" effect. I don't find it in the ads I see in Japan in regard to the glass coating. The law of gravity plays out on the paint surface; so, it there is not enough energy to move a water droplet from the surface, that droplet will dry off slowly and leave some residue. What I can attest is that water spots on my cars have been much much less than what I used to have when I used regular waxes or polymer sealants. Luckily, I don't get drizzle that much where I lam.
 
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