gzt: Looks like a number of outfits are providing this service. I had a look at a few websites. The claims about UV reduction and IR reduction should be easy to verify with cheap equipment.

It's down to two things. The quality and durability of the formulation, and the skill and technical ability of the applicator.

What surprises me, I can find no well known names supplying this stuff. For instance, if it was any good, and durable, I'd expect 3M or similar to have a product. The fact that they don't, makes me suspicious as to the durability of the product.

it looks like they sell this product for $117 in the US, but i don't know how to ship it to NZ. The NZ company may not want to sell just the product. 

If there is a way they can be shipped here, i don't mind buying a gallon try it out. it doesn't look like a rocket science to apply it on the glass. 

if it indeed does what they say it does, it would be a excellent product, i wonder why it did not become popular in NZ.