Hi simon , as david 317 said , get a drinking straw (preferably the big ones , ie. Mcdonalds or burger king!) and fasten it to the nozzle with tape . Then just spray into a jar etc. Put some cling film over the opening and poke the straw through it to stop the atomised spray blowing back all over your fingers. When youve got enough, let it stand for a while to let the propellants evaporate a bit , then spray away! I used a silver acrylic aerosol , decanted and thinned with cellulose thinners on my Tu 22 Blinder and it gives a finish same as alclad , although like alclad make sure you prime the bare plastic if youre using cellulose to thin the paint, cheers tony