Hurricane and Spitfire: Is the weathering always turned on?

[major_setback]

I started skinning a Hurricane, but found that the weathering always seems to be turned on (mostly fully on), and it makes skinning judgements difficult. Is this something wrong in my set-up, or something to do with the present state of the game? Altering the slider in the plane options doesn't help.

(I had heard this was an issue with the Spitfires, but not with the Hurri's).