PAINT BRAND SWITCH

Ive been doing body & paint part time for about 30 years now im doing it full time. Ive always used PPG products but the place where i get it is about 40 minutes away plus there shelves & mixing products are getting very limited. The napa store right down the street from me sells & mixes paint. They sell Martin Senor. When it comes to PPG ive always used the shopline base & the Deltron 4000 clear. Between the price of gas & them not being able to get products just trying to find an alternative thats closer to me. Ive sprayed Martin Senors cheaper base & its not much different than shopline. Im just concerned about there clear. As of right now a gallon of Deltron 4000 clear & a quart of hardener is just about $800. I dont seal my cars. I have friend that is a teacher at the local tech school & a friend that is a PPG rep. told me the paint companies want to do away with sealers. I spray with a 2k primer block sand it with 320 or 400 then base it.