What the f*** is Gangplanks weakness

So recently ive played against a few gangplanks, tried different champs, and googled about what his weakness where, which i remember being his early game, thing is with bone plating and his passive his early game is so good, i tried to play renekton into him but all my w was cleanse by his and my damage nullified by bone plating, the only thing i could do was play like a b**** and get outscaled cause hey armor shred on an ability which can be insta cast and detonated by an average gp, also the % of missing health heal on his W makes me feel like his sustain can just screw me over unless i play something that will ruin the comp (teemo, vayne <- Probaby pretty bad)
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