Originally Posted by lr172
I love the stuff. I have painted several project cars and the 10 will be my second plane painted with SPI. I also left the SPI epoxy as my final interior coat. 600 hours on the 6A and not a scratch, excluding a couple of couging accidents on my behalf. It is tough as nails. Plus, you can't get better support than what Barry provides. It sounds like more and more aviation folks are now using his stuff, last I talked with him.
I was actually wary of it at first because of all the reviews I saw on forums made me think it was someone paying for reviews. It's also a better value than other products, especially when you consider the price includes shipping. I have to say it lives up to its reputation.
Agreed on support from Barry and the people who answer the phones. I called them a few weeks ago to ask if it would survive in the bilge of a boat and they said it would love it. The heat helps curing. I switched to it from PPG Aquapon 35. Ordered it and it showed up the next day.
I used their waterborne cleaner for the first time and got some fish eyes though. That may be from me using the towel too much though and not using my usual Wypall X80 towels. I'll give it another shot.
It sands nicely for an epoxy as long as you are in the window. The only thing I've found that will attack it is phosphoric acid. I was treating some rust with it and got some overspray droplets on primed parts and it made perfect little divots where the SPI was eaten away.
I used it to coat the fuselage on a 2/3 Jenny and it's held up so far, although it's yet to fly.
The TDS says it can be applied to bare aluminum. Do you scuff first?