The underwing area needs protection to reduce the likelihood of impact damage from below creating bulges on top.
Mudflaps are simple enough to fit without drilling, but needs a bit of creativity in design. Use 1.2mm aluminium or circuit board as the base with a neoprene cover.
Trads of a certain age come with front underwing shielding as standard but this can dry and peel over time from the exhaust heat. I replaced my Roadster protection using Wickes pretend lead flashing. This has a grey plastic finish which looks like lead flashing on buildings, and has a black tarry adhesive backing which is at least 1mm thick. In order to heat proof this over the cats I added adhesive foil (Reflect a cool) and this has stood the test if time over several years. However, surface prep is crucial, and it's a messy and lengthy job cleaning the underwing area.
Original post here:
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