User blog comment:WillofOP/DF weaknesses: Haki, seastone, and Cutty Flam/@comment-2031609-20110725170109

I think the seastone is a possibility, or if anything he'll use it to reinforce the Sunny. As for the lasers, I'm not too sure of. If I remember correctly, and I may be wrong, but I think the lasers were supposedly "taken" from Kizaru, and I don't think Vegapunk had access to Kizaru while at his home island.