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The above video demonstrates a wash down test where mortar was allowed to dry on the heat shield. The top pipe (Not powder coated) shows signs of wear after pressure washing with a 4000 psi pressure washer at about three inches away, the bottom pipe (Powder Coated) shows no signs of damage at the same psi and distance.
Download Zip File: video1.zip 136 MB

The above video shows a 4000 psi pressure washer aimed at a Powder Coated heat shield for well over five minutes at three inches away with no damage to the shield, whereas the following video shows the same test on a non powder coated heat shield with damages showing in less than a minute.
Download Zip File: video2.zip 308 MB

Download Zip File: video1.zip 39 MB