Gyproc Joint Filler 12.5kg is used in the first stage of jointing and provides cost effective bulk filling. It is easy to mix and has a quick setting time. It is ideal for mixing by hand but if you are mixing mechanically, use a low speed mixer. When the product starts to set, it must be used immediately as it cannot be remixed. It creates a great surface for you to begin working on but to fully prepare your walls for decoration, use Gyproc Primer for a smooth, crack free finish. For more information, call us today. PLEASE NOTE :- Returns policy on plaster products: Due to the volatility of plaster products, once delivered or collected we regret that we are UNABLE to accept materials back for credit.