REJELDINITROL DIY RUST PROOFING LITRES KIT FOR MOTORHOME & VAN

I have tried to apply Dinotrol, using a compressor that comfortable exceeds the minimum, a 2hp 50L at 9cfm, set at 5 bar. Initally the stuff came out all over the gun, everywhere but the nozzle. OK, borow another gun, make sure it isn't the tool. Second attempt, same result. Now wether it needs to be at a certain temprature to work. Ambient at the time was 17 c , well nothing on the info says so.So I went and bougth 5 liters of Vactan, painted that on, about 1 1/2 litre to do a Land Rover Discovery chassis, then a 5 litres of black roofing paint and painted on brush and 50/50 white spirit sparyaed through gun inside.