![]() ![]() Even when they use coated, the stamping process plays havoc with the coating.To add to all this, the water based paints are brought to a fairly high pH, on the alkaline side, but over time the material used to get that high pH (ammonia or morpholine) evaporates and the pH gets lower and lower, thereby adding to the corrosion problem.The rust in the can often changes the colour of light wall paint, so where the paint is to be kept for touch up purposes it pays to decant what is left in a well sealed plastic bucket type container. The other problem is that the rims are supposed to be stamped from the same coated tinplate, but half the time they use plain. This has been an ongoing battle between paint companies and can manufacturers.The cans for water based paint are made from tinplate roller coated with an epoxy based varnish, but sometimes the coating is really too thin.
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