POR 15 does not like self etching primer.
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POR-15® Self Etch Primer Spray Can for Rust Prevention - 15 oz.
POR-15 40204 Metal Prep Rust Remover/Pre-Primer Quart - Etches
Por-15 41018 Self Etching Primer 15oz Aerosol
POR-15 41018 Self Etch Primer - 15 fl. oz : .in: Beauty
Por 15 Metal Prep Directions Fantastic Savings
POR-15® Self Etch Primer Spray Can for Rust Prevention - 15 oz.
Por-15 41108 Tie-Coat Primer Pint
Auto Body Tools & Body Shop Supplies
VHT SP307 - Self-Etch Primer; Green; 11 oz - CSPRacing
How to properly paint tow hooks for beginners?, Page 2
Primers – POR-15 New Zealand
POR-15 Self-Etching Primer