Originally Posted by deadbodyman
I've done a few tests of my own and really pushed the limits of SPI before I was ready to recomend it ...One test was leaving 36 scratches in my filler and using 8 coats of epoxy primer to fill them (it took a whole week to cure) before it could be sanded,the scratches sanded right out never to be seen again its been over five yrs and un painted exposed to the elimates and everything ,no problems at all...
then Barry and I (and a few other pro's) had a disagreement on my use of ospho as a metal prep( he dont like using it) I've been using it for over 30 yrs and wont do a resto without it.so I did two panels ,one bare steel and primed and one treated my way with ospho and then did some adheasion tests with duct tape and using a razor blade cut into the primer to the metal making little 1/4"squares then the duct tape ...then I sanded them both down to the metal to see just how well they feathered...I couldnt find any differences in the two panels both passed every test....However when I cleaned up my yard two yrs later I found that old hood and found the surface of the side I didnt treat was starting to rust where it was previously rusted under the primer and the side I treated was not....Now I'm even more dedicated to the Ospho than ever also SPI epoxy.my two favorite products ever...
Thanks Mike, you answered my question from another thread....I couldn't figure out why it took you 8 coats of primer to fill 36 grit scratches and it only took me 2 coats to fill 24 grit scratches that had been lightly DA'ed with 80 grit....I didn't realize that your 36 grit scratches where on filler, leaving a deeper foot print than 24 grit on steel...that coupled with the fact that I, for all intense and purposes, pounded my primer and you probably applied it correctly.
It's good to hear that you found your hood and you have a test that is 5 years in the making....my test is only 3 weeks to a month old and I fully expect the panel with the 24 grit scratches to sink...how much remains to be seen.
I've never tried OSPHO but I think I should give it a try as well.
Thanks for the clarification Mike...I was somewhat confused for a while there.