best to water proof spark plugs

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well we is gunna get some performance lead but wanna make it as water proof as possible and wantet to know if you can cover the plugs in summmink
 
i use WD40 on my boat outboard, i hose the engine down with the cover off every time i use it, then cover it in WD40 especially the spark plugs. If the boat gets flipped, its new spark plugs. Not sure of any way to fully protect them. Its only a 5 min job on a boat to change them though!!
 
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