I mean it would make sense that "water" can wash away paint and so jumpinging to SEA water would have 2x the strength, but we've already done that so while it would make sense I hope there is another way to cancel it out as well (i'm thinking it'll be something funny relating to modern art)
Maybe they trick her into thinking about an art style that would make them stronger. And I agree that the salt water should remedy it since it worked with Moira's power on the zombies.