Mitch (Cubcrafters) recomments using PPG DELTA DX1787 Etch Filler and DX1788 Catalyst over bare aluminum and carbon fiber. My local PPG dealer says that it has been discontinued and can't order any more.

Has anyone else ran into this problem and if so what is the recommended alternative to prime bare aluminum and carbon fiber? (boot cowl, cowl, struts, cover plates, etc.)