What element would cause sealant degradation?

[Rick72]

Sun?
Rain?
Dust, pollen and road grime?
Of these which one has the strongest negative impact on sealants longevity?

[paramount]

Rain?

[FUNX650]

Sunlight, humidity, acid rain, chemicals/mechanical-means (such as: abrasive fluids' impingement; car washing/drying)...
surely influences the degradation/longevity of LSP's...including Sealants.


But it is in my humble opinion that the biggest culprits (co-workers/co-conspirators, so to say) are:
1.) Biological-'materials'.
These include insect bodies, tree gums, and bird-droppings.

2.) The effects that base-coat-pigmentations have on the "performance level" of clear-coats.

:)

Bob