Sorry ed, I didn't see this thread until now. I used to sell natural rubber products that were used in extreme conditions, sun, 4x stretch. The white is the latex protein being oxidized. All natural rubber does this when exposed to air. UV light accelerates it. Freezing it stops it "cold" haha.. Synthetic rubbers like butyl etc don't do it, but they don't have anywhere even close to the elongation characteristic of 100% pure natural rubber which can stretch 7+ times its relaxed length before breaking. So, it is
very flexible, perfect for driver surrounds like foam and leather too.
To protect my products I repackaged 303 and included it. It makes a barrier that keeps oxygen off for a time, but flexing the rubber and continual exposure to air will wear out. So reapply every 6 months or a year. Try to keep it out of direct sunlight from nearby window. There are window films that will block most UV, 3M makes the best one, but you need to get a pro to install it.
Maybe contact Devore for advice first just to make sure it is really pure rubber and see what they say to put on there. I bet they will have a reasonable answer. If not, then go for the 303.
It can't hurt anything. I wouldn't use anything else on it though. Armor-All and similar decorative treatments with silicone will accelerate the aging.
Rich
