Hi. I have a 10 litre tin of Dulux weathershield exterior low sheen in vivid white. I bought from Bunnings a while ago and now no longer have the receipt. I want to be able to have it tinted to Colorbond Pale Eucalypt. Can I purchase from Bunnings the suitable amount of tint for this colour to add to the 10 litres. How much would it cost for how much tint I need?