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ResistAll is one of many trade names used to describe a synthetic paint sealant, usually applied by dealers at a massive up-charge. It is a straight up high durability paint sealant; like the ones you can get online for $19.99 and apply yourself easily. They (ResistAll, Xzilon, Glare, Symtec, etc) all wear off within about 6 months (depending on maintenance). They offer no scratch resistance. They normally come with a 5 year warranty if dealer applied (inferring they last 5 years, they don't); to maintain the warranty the fine print will mention re-application every year, which no one does (so it's a great sell for dealers). The warranty will cover random stuff like paint flaking (hah!). It may cover decent stuff like bird poop etchings or acid rain, but will also require all work be performed by the dealer (so a kid with a rotary that he's been using paint time for 4 months).
Opti Coat/Guard is a ceramic coating; it leaves a ~1-2 micron coating on your paint that is slightly harder than your clear coat. So it'll offer some swirl/marring resistance. It will not wear via chemicals, so it is essentially permanent unless you choose to abrade it away. It can be sold with a warranty in the US if applied by an authorized installer. It can be purchased commercially and applied yourself, but with no warranty.
In short; I think I can go on a limb and say opti coat has proven itself (it's been out ~5 years and shows clear evidence of lasting at least that long). The dealer applied sealants, are, well, a lot of money for very little result.
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