nova 4-core radiator

[1968 nova ss]

I know the 4 core nova radiator are gloss black in color.Had to remove the rad and have a small leak repaired.My question is;I have a quart of ppg 9300 urethane paint ;will it hold up to the heat of the radiator ;or should i use some high heat paint from a spray can ,by the way ;when flushing out the block and particular ways anybody goes about flushing out the block.thanks,chris

[indyjps]

Ive got an adapter that goes on the heater hose and hooks up to a garden hose, not too high tech but it gets the old coolant out. Kinda defeats the purpose if youre wanting to use treated or distilled water in your cooling system though.