From the POR website;
POR-15® was applied over a rusty substrate as a finish coat (approximately
23 mils dry film thickness). The coating showed essentially no undercutting
at the scribed area after 2000 hours in a weatherometer*.
A 2 mil thickness of POR-15® was applied to lightly rusted steel and then
exposed for 1000 hours to a salt spray. At the end of the test period, no
undercutting was observed at the scribed area.
Michael Sergi
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