Join Date: Aug 2007
Location: So. Ca.
Car Year: 2008
Car Model: Forester 2.5X Prem
While some of these coatings may actually work (i.e. remain on the finish for a given period of time), they are typically not immune to scratches, blemishes, etc. that you may later find you want to remove/correct. However, removal means abrasion and abrasion means you will begin to remove the coating.
On the flip side, some of these coatings are advertised as being harder than most clearcoats and may actually offer some additional resistance to scratches (if they in fact are). ....and on a soft-paint vehicle like a Subaru, that could be a good thing.
Regardless of how legitimate a system might be that a dealer is selling, I would never buy it. ....from them. A point that is rarely brought up but I feel is crucial is "preparation". Some of these coatings are quite hard and some can be relatively permanent. The only problem is that the finish needs to be properly prepared prior to the application of the coating. Any scratches, blemishes, etc. that are not dealt with before applying the product will be locked in thereafter. ....and it won't be correctable without first removing the coating.
If you're looking for a permanent/semi-permanent solution, there are reputable, professional detailers who use products from manufacturers like Aquartz, GTechinq and Optimum. Some even offer warranties. I would much rather go with a reputable detailer than a dealership for something like this.
....btw, Optimum Opti-Coat (one such "permanent" coating) has recently become available to the public. In the past it was only sold to pros. Autogeek started selling it last Friday (for those who might be interested). It's not for the average Joe since (again) you do need to make sure your car is properly prepped. ....but for the enthusiast/DIY'er, I can see it being a big hit.
'08 Forester X Prem
'10 Challenger R/T