MyDogsPA Posted August 17, 2016 Share Posted August 17, 2016 Guys, Ever since I had my airplane painted 19 1/2 years ago I've polished it annually with Astro Shield. The paint is a non-clearcoat polyurethane, specifically DuPont Imron. As a friend told me once, and my experience seems to back it up, polishing with a product that has dimethylsiloxane as an ingredient just seems to look better and better the more often it's used. But I need the polish to do something more than just make the paint look good: the paint must survive being outdoors in direct sunlight for year after year and not degrade in Los Angeles smog and dust. Degraded paint on an airplane causes it to get rough and just slows it down as well as negate protection against corrosion (and that can kill an airframe) So my routine over the years has evolved to polishing the plane once a year with two coats of AstroShield. The first pass removes the smog grime buildup, the second shines it up nicely and deludes me to think it will last longer than if I only did one coat (that may or may not be true, but at least it looks good) I know, I should polish twice a year, but getting access to 120VAC for the polisher it problematic out on the tarmac. Plus it's 173 sq ft just for the wing alone, so it takes a while. Astro Shield lists dimethylsiloxane as a prime ingredient. Unfortunately Nord Viscount, the makers of Astro Shield, went out of business, so I'm down to my last 3 cans from the case I bought years ago. Eventually I'll have to find something to replace it. I learned about Optimum from my shopping at Autogeek when I buy my pads for my Cyclo polisher, and I was curious about Optimum Poli Seal as well as the 3M 39030. The latter lists Decamethylcyclopentasiloxane and Dodecamethylcyclohexasiloxane as primary ingredients in their MSDS ( up to 13% and 10%, respectively) so that seemed like a possible alternative. Reviews of the 3M 39030 indicate it may be difficult to remove, possibly if it's dried. Reviews of the Optimum Poli Seal seem to be glowing (easy to apply and remove), but I have no clue what's in it or if it is even compatible with all the AstroShield I've been putting on over the years. Again, I need the polish to maintain the paint so it remains smooth and protects the aluminum structure. (repainting a plane costs anywhere from $15k to $20k nowadays, so obviously I want to keep it lasting as long as I can) Is Poli Seal similar? Can it keep the paint in good shape with annual applications? As an aside I also have a 1992 F-150 that also has no clearcoat (it was one of the last years where black was offered without clearcoat). I'd let the paint fade as the truck sat out in my driveway for years and years, and last year the roof was starting to rust after the color coat and primer eroded away. At first I thought I'd have to paint the whole truck, but I got out the AstorShield and the polisher and gave it two coats. Except for the roof, the truck looked brand new. Yes, there was a lot of black on the pads, but I wound up only having to paint the roof itself and not the whole truck. Now, a year later with nary even a wash, the paint still looks great. What does Optimum have that works as well? Thanks. Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.