My grill block was made of gorilla transparant tape and has stood up to hail stones snow very heavy rain etc still waiting for summer. Vitrually undectable. Engine temp has never gone above 89c according to car computer.
Actually I agree having seen it done recently. It wasn't designed to be DIY friendly but it probably is the most - kind of like an old Spitfire GT6 bonnet is.
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[I]So long and thanks for all the fish.[/I]