White Resin Radiator Keys (R7027) (5 ratings) £1.00 Quantity: at £1.00 each Add To Basket Pack of 4 27x 18mm 34 x 25mm Flat back. Each piece is handcast from white resin. You can easily change the colours of resin by painting them with gesso, then they can be sprayed with any product, Lindy's is my personal favorite. Paint them and even glitter them. Please allow for slight defects in casting.