What materials would be best used to 3D sculpture motorcycle accessories?

I am an avid sketch and design hobbyist. Also a chopper enthusiast. I have done minor wood and clay sculptures in the past.

I am interested in adding some 3D graphics and art to my next chopper.

What would be the most durable and easiest to work with materials that can withstand the climate, the speeds, the constant vibrations of the ride?

Have thought about JB weld and putties like that that are very maleable and would be easy to fix to the thank and fenders. Any other ideas?
 
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