I have had an education in the last week concerning yellow paint. Back in the 70's and 80's, I painted a lot of cars, some of every colour. I have had experience with "transparent" paints, but at that time the worst colour of all was the metallic copper colours. It was virtually impossible to lay down a uniform paint job without first spraying a white coat to cover everything a uniform colour before spraying any copper colour. I don't remember any particular problems with yellow paints, concerning "hiding" and "transparency". Centari by Dupont was my favourite paint----fast foreward 20 years----I decided that when the roadster pickup was finished, I would spray it in base/clear, 2003 G.M. "slingshot yellow", a Corvette and SSR colour. Two days ago I began making serious enquiries at the local PPG and R&M paint dealers.----Now get this---that colour is $675 a gallon, just for the base. Then add on the clear---then add on the reducer---then add on a gallon of white----yes, this paint is an extreme low hiding, same as the old metallic coppers.---We're talking $940 plus tax for material alone----if a gallon will be enough. I have been looking at other yellows today, and looking at the possibility of using an acrilique enamel instead of a base/clear, as that is a bit cheaper---but even then, pretty well all the yellows now are "low hiding", and require a base coat of sealer to get colour uniformity.----Knock me dead. I used to paint cars for $200 and pay $95 for enough paint and reducer and hardner to do a full size car. I think the $500 I had budgeted for my paint job is gone with the wind.