After Martket Thermostat Housing

12many said

Fine sandpaper and a flat surface, rub the stock, aftermarket, chrome plated housings in a gentle circular/figure 8 motion until you see a uniform flat surface, skim coat of ultra black on both side of a paper gasket, torque to specs, allow to cure fully before it sees any liquid and good to go. Never had a problem with my method. All in the prep and assembly. And you can repair a corroded or warped housing also this way, been there, done that.

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I tried that when I was having constant leakage from my housing. I used varying grits of PSA backed dry sandpaper like you would block sand with that was stuck to my flat work bench. Started with 220 and ended up with 400. It was very smooth and flat. I did what I could with the intake mounting surface while still on the car. Still seeped. So I spent about $60 for a Billet Specialties housing with an O ring, and no more leaks. I don't know what the problem was, but I had given up.