From: "Robert Comer" 

> Why would this occur at a greater incidence than above ground vehicles?

Sand dries thing out when it's buried in it for one, and for another,
aboveground vehicles usually move around, flexing those boots and that
keeps it pliable so they don't crack as easily.  that said, I bet there's
lots of failures on aboveground vehicles too, that environment is harsh.

> Silicones last for the life of the vehicle in fact unless physically torn.

In normal usage, maybe (I've had failures), but bury them for awhile...

- Bob Comer


"Tony Ingenoso"  wrote in message
news:42dddc91$1{at}w3.nls.net...
> Why would this occur at a greater incidence than above ground vehicles?
> Boots/seals routinely last for many years above ground in much greater
> heat.
>
> Silicones last for the life of the vehicle in fact unless physically torn.
>
> "Robert Comer"  wrote in message
> news:42ddc471$1{at}w3.nls.net...
>> Any of these rubber or plastic boots are going to dry and crack when
> buried
>> in sand...
>>
>> - Bob Comer
>>
>>
>> "Tony Ingenoso"  wrote in message
>> news:42dd9d6a$2{at}w3.nls.net...
>> > Via what mechanical mechanism does sand accomplish this magical
>> > penetration
>> > of sealed units?
>

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