OOh, could of done with these for the polystyrene ceiling tiles!!! Look great! No, absolutely no fumes at all from the Wallwik; it's a blue solution that just gets dissolved in the warm water and it is completely odourless and non toxic. As I say, if you're not happy for any reason then you get your money back within 30 days. Also, the customer services at the company are really really helpful and lovely. When our delivery was late coming they immediately refunded the postage cost to my card and had a go at DHL on my behalf! Really nice to deal with.