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Is FIMO suitable for outdoor use?

Once completely hardened, the oven-hardening compound is weatherproof but should not be varnished!
 
It is important that the hardened model has no cracks through which rain could penetrate. Otherwise the model could burst in freezing temperatures. 

The colours might fade a little over time when exposed to intense sunlight; a protection of some kind is therefore recommended, a canopy for example.