This may be a daft question but I'd rather ask than find out the hard way. Am I likely to run into any trouble painting the undersides of some shelves with Dulux satinwood? Am I to expect a lot of dripping? I've used it on plenty of vertical surfaces (doors, skirting etc.) but never something that is essentially upside down. I can't remove the shelves because they're built into alcoves. I'm not looking for an alternative product.