Originally Posted by
atbalfour
I know I am generalising but the more I test, the more I find that toppers just struggle to bond to the underlying coating. At least that has repeatedly been my experience using coatings from Gtechniq, Gyeon and CarPro which have all had distinctive water behaviour.
My latest dabbling was using NV`s boost as a QD over CarPro SiC - left to cure for 4 hours and hosed down the panel, clear to see that particular section was down on hydrophobics, which makes sense as it isn`t as hydrophobic as the underlying SiC. One wash later - I noticed the snow foam `clung` to that area where I had applied Boost and when I rinsed the SiC beading had returned, foamed it and there was no `cling`... just to note that I have had the same experience with Cosmic/High Gloss. With Boost, I find that acceptable but not for products of the type and price bracket as Cosmic/HG. Durability can be nearly doubled when applying them to bare paint - I used to blame my wash chemicals for stripping LSPs, in reality I strongly believe that they struggle to adhere to the extent that they`ll last next to no time at all.
Toppers are really only `required` where you have an ageing coating, or you`ve chosen a coating that significantly lacks characteristics the topper brings. Of course topping has that fun factor which many crave, IMO though if you choose a top top coating applying a topper can do nothing but detract from it.
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