"The Heat is On" -- ALERT

For those who want to know the product is made from orderless mineral spirits and a mixture of various types of silicone. It will dry out over time. However if you keep applying it the silicone will keep the surface moist and slick. The solvent is used to aid in quick drying of the material when applied.

Tire wet is very similar. Have you ever noticed how your tires look after a few days in the sun? Discolored and faded.

You all are an intelligent bunch you figure it out.

Bozo: so yr point applies to ANY silicone based product -- or is there a particular brand that would be less likely to create problems? Thanks

Silicone is may not the agent for the drying, I feel it is the solvent. So look at the materials used in the mixture. Frankly I would ask questions about this topic to the speaker designers. They would have a better history in dealing with this topic.

Oh man....Armor-All is an AQUAEOUS product containing a monomer that binds a single-molecule layer over vinyl and similar plastics. I don't think there's ANY silicone in it!
The problem with speakers is that some surrounds are made of butyl rubber, for which Armor-All doesn't act as intended.
On vinyl it's great for sealing/protecting the surface.
Silicone mixtures simply COVER surfaces, shining 'em up (tires, etc.). Armor-All shines up vinyl, etc., by returning it to an ultra-smooth surface that reflects light.

Bozo, thanks. Subaru, is there any product that could help in maintaining rubber elasticity -- as in speaker cone surrounds? Thanks