I and Merlinman used sealant on our's. On Merlinman's first SVA, he had the headlights just sealed in. SVA guy failed it on this point. He was a bit of a jobs worth and was very nit picky (probably the guy who will do yours!) Also, Steve, SDM.. managed to get hold of some blue sealant, so it matched the body colour.
Though he did not like the way Marlin used bungees to secure them, he said had Merlinmans been secured this way, he could not have failed it.
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