Some takeaways from all the responses:
The decision for using a cover (or not) is dependent on many factors.
Conditions where I would NEVER use a cover:
1) A warm climate where winterizing isn't necessary, and the RV is used more or less year round. Why hassle with a cover when wax will protect the gelcoat - and can be applied anytime desired.
2) A geographic location where fairly strong wind is a constant. However, if combined with sustained freezing temperatures where waxing cannot be done for months at a time - I would consider alternative methods of covering/protecting the gelcoat... indoor/covered storage or a longer lasting professional ceramic coating.
Conditions where it makes sense (for me at least) to use a cover:
1) A climate (excluding windy) where you winterize your RV (non-use/storage) for more than 3 months at a stretch... where temperatures/weather are not conducive to washing/waxing. Read: Most of the midwest/northeast U.S.
2) A situation (for whatever reason) where your RV is stored for an extensive length of time, and no other option is available. This includes not having access (or ability) to keep the gelcoat waxed and protected. This of course would (in my opinion) exclude the high wind geographic areas... but it's a choice between chafing paint or destroyed decals/severely oxidized gelcoat.
Bottom line... First option should ALWAYS be to use a wax or professional ceramic coating when possible - but use a cover when that isn't a realistic option.
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Be creative, and have a fun life...
...and don't be an @**hole! -Ken Block
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