decopauging

[lovealwaysliz.livejournal.com]

Question for you craftgirls and boys....Is there a way to make a decoupaged plastic bottle waterproof?  I would like to decorate a soap dispenser if possible because every time I purchase a pretty liquid soap dispenser, the pump either breaks, or just doesn't work, period.  I was thinking about decopauging just a regular Dial bottle....anyway to make sure it won't "melt" off if it gets wet?