The Holdtight question thread has got me thinking, so I did a little research on it, and their claims are impressive.
So how clean is clean enough?
We use SPI epoxy because it sticks better, but most still say its ok to spray epoxy over light flash rust---even barry. OK, Barry's epoxy will take care of some flash rust as far as future problems, but how well does it stick to the metal that has a thin layer of flash rust? Also if you sand the flash rust off, it is still in the original rust pits that were blasted clean, it really takes compressed air to dry those pits. So how clean is clean enough?
Some on the forum say that priming after blasting is ok, as long as the surface was clean and fresh blasting media was used. But as pointed out in the Holdtight literature, there are still tiny bits of shattered media and other tiny bits of contaminants all over the surface, such as rust and paint. So how clean is clean enough?
They say it works better with a pressure washer, and that makes sense if it is going to clean embedded contaminants.
As said before, we use SPI epoxy because it sticks better, which means less paint chipping. But would it stick even better without the problems mentioned above, and just an overall cleaner surface?
https://holdtight.com/products/holdtight-102/
https://holdtight.com/industries/automotive/
https://holdtight.com/wp-content/uploads/2021/02/HoldTight-SDS-8.5.20-FINAL.pdf
So how clean is clean enough?
We use SPI epoxy because it sticks better, but most still say its ok to spray epoxy over light flash rust---even barry. OK, Barry's epoxy will take care of some flash rust as far as future problems, but how well does it stick to the metal that has a thin layer of flash rust? Also if you sand the flash rust off, it is still in the original rust pits that were blasted clean, it really takes compressed air to dry those pits. So how clean is clean enough?
Some on the forum say that priming after blasting is ok, as long as the surface was clean and fresh blasting media was used. But as pointed out in the Holdtight literature, there are still tiny bits of shattered media and other tiny bits of contaminants all over the surface, such as rust and paint. So how clean is clean enough?
They say it works better with a pressure washer, and that makes sense if it is going to clean embedded contaminants.
As said before, we use SPI epoxy because it sticks better, which means less paint chipping. But would it stick even better without the problems mentioned above, and just an overall cleaner surface?
https://holdtight.com/products/holdtight-102/
https://holdtight.com/industries/automotive/
https://holdtight.com/wp-content/uploads/2021/02/HoldTight-SDS-8.5.20-FINAL.pdf
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