I suggest used Marine grade vinyl ( mildew and mold resistant ).
If you drive your Cobra you will get caught in the rain.
I logged maybe a 1000 miles in the rain out of 42,000
Never ( oh yea, one time) left the house in the rain but I did return several time in the rain. Parked under a lot of gas station canopy's, bank drive thru, etc.
A cheap tarp and bungee cords in the trunk is a good idea. Quick and easy to put on till the rain blows by.
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