justin_o_guy2 wrote on 02/05/11 at 22:24:55:Why do people want to use Primer? Really? You asked that?
Duuude,, Come Onnn,, thats NOT the question to ask here.
The question that needs answered is....
Why would anyone want to paint anything that wasnt rusting or somehow desperately in need of paint? You guys who can paint, I envy almost as much as guys who can dance. Almost
I meant on chrome or aluminum parts. And you must also understand that 'primer' is a generic term. Primer by itself does not inhibit rust, nor does it help paint stick. Primer fills scratches, primer gives you the ability to add material to hide/cover imperfections. You don't want to sand away the base material, so you spray it with primer. you want a temporary 'shield' from the elements...you use primer.
You want to seal off something, you use an etching primer or primer/sealer. Flat spray paint works better than primer. Why is there no primer under good powder coating?? Why no primer under electroplated parts?? Why no primer under painted aluminum??
Unless you need to fill some scratches, don't wanna change the profile of the part when sanding, or you have a lot of plastic filler (which soaks up paint like wood) leave the primer on the shelf and use paint.
It may take a little more paint to cover, but use as little primer as you can. Ask any real painter and he will tell you, primer is for bare metal only, or as a tool to gauge the flatness of a panel when you use 2 different colors. Prime it gray, mist coat with black. When you sand it down, any shiny spots mean its high, dark spots (black primer) means its low....