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Old 05-11-2018, 01:46 AM   #1
Bulkhead
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Fusso coat failing in the heat?

I light of the recent hot UK summer I'd thought I'd see if anyone has experienced the same thing with Fusso dark. Mine's been on for around 8 months and I've had to re-coat the roof twice as it looked like it had failed. The whole car was prepped properly and had the same IPA wipedown. Everywhere else on the car is fine but for some reason the roof loses all beading at the front. I'm mindful that beading is not a sure indication of failure but it beads like crazy when first applied and the rest of the car still does. Temps have been around 30-40 degrees with little rain. Always washed carefully with BTBM but apart from the dust it doesn't get too dirty. I've seen longer durability with Dodo SNH in the past and thought this should be better.
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Old 08-11-2018, 09:12 AM   #2
shelton
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Any wax can melt or soften in hot conditions, and then some dust may embed into the surface of the wax and disrupt the hydrophobic properties. The wax is still there, it hasn't come off or broken down, just the embedded dirt (maybe invisible) has changed the surface structure.

The good thing about Fusso Coat is that it is very resistant to detergent, so you can usually wash quite thoroughly to remove the top layer along with the dirt, without accidentally removing all the wax. Then after a shampoo and scrub, the hydrophobicity returns.

Actually, this is true for any wax.
Ordinary wax too, doesn't "fail" or really disappear just by driving around for a couple of weeks, it just gets clogged with dirt and loses that hydrophobicity. Unfortunately with pure carnauba wax, washing away that dirt will also remove quite a lot of the wax, so you can only wash a few times before having to wax again.

A simple illustration:



Using BTBM or other "mild" shampoo prolongs the wax durability, simply by being less powerful. However, when that dirt is embedded in Fusso Coat, which is resistant to even strong shampoo, a careful wash with mild shampoo may just not be enough to remove even the top layer of contaminated wax!

Try using something stronger or more scrubbing (haha) to remove that embedded dirt and expose a fresh surface of Fusso Coat.
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Last edited by shelton; 08-11-2018 at 09:17 AM.
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Old 25-11-2018, 11:07 PM   #3
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Thought I'd post a quick update - just re-applied a coat of Fusso as it had completely gone on most of the car. I hadn't realised it was 10 months since I first applied it so that's pretty good in my book, especially considering it's relegated to the driveway so sits outside all of the time.
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Old 28-11-2018, 10:30 PM   #4
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Quote:
Originally Posted by Bulkhead View Post
Thought I'd post a quick update - just re-applied a coat of Fusso as it had completely gone on most of the car. I hadn't realised it was 10 months since I first applied it so that's pretty good in my book, especially considering it's relegated to the driveway so sits outside all of the time.
10 months is very impressive!!

Gonz.
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