Diamond Guard age well like wine

I bought a bottle of Diamond Guard 9yrs ago for my previous vehicle. It did not have the desired effect, but then again the laquer of the vehicle was gone, in the Gaurd's defence. Last week I saw the bottle, and decided to use it on my current vehicle. Wow!! What a transformation. Even the lights faded yellow due to the elements looks brand new. It could be that the product is like wine and gets better with the years, or it could be such a good product that does not age at all. All though not all gadgets and products are great from Verimark, the Diamond Guard is definitely worth the pound.