This is probably not the answer that you were looking for but...... The automotive paint that I use is custom made for me by an automotive paint shop. I give him the PPG code from online paint charts and he mixes up a batch and puts it in an aerosol can. Cost is around $30 per can but you can easily do 3 cars with 1 can. Maybe you have a local body shop supply store that can do the same thing for you?