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Hi Eoghan, Dulux is (was) the trade name for DuPont's famous alkyd enamel. I do not believe DuPont makes it anymore. That type of paint is no longer used to any appreciable extent in the auto refinish industry. The 421 is the color formula (Cat Yellow?). It is still a valid formula in most of DuPont's current automotive chemistries, according to their website. If you want high end, look into ChromaOne acylic urethane or Imron polyurethane. A more modest cost would be Centari acrylic enamel, although still rather high in price. A more cost effective solution would be found in DuPont's NASON line of automative paints in either an enamel of a urethane. If you don't have supplied air for breathing protection, your choices are Centari in a 1k mix or NASON FastDry acrylic enamel, neither of which require a hardener. If you don't have a DuPont jobber near you, look into PPG for formula 81985, which crosses from the DuPont 421. That should be available in most similar PPG automotive chemistries. The equivalent to Centari would be Delstar, also an expensive acrylic enamel and hard to find anymore or PPG's more cost effective OMNI MAE acrylic enamel. Those two would be the choices in PPG that can be used safely w/o supplied air (I think the Delstar can still be used w/o hardener - but no longer positive of that). With supplied air, the PPG choices also include the enamels with hardeners and the urethanes, similar to DuPont. Frank, if you read this, whatever happened to Dulux? I see the name now being used by ICI(?) for a latex house paint!  Rod
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