epoxy primer question
I am new to the epoxy primer but figured I would give it a try on my bucket truck. The bottom of one of my bins rotted out over the years so I have cut it out and am getting ready to bend up a new one. Original was black steel sheet but my plan is to make the new one out of 18 ga galvanized. Question is, will the epoxy stick to galvanized with just the normal 80 grit sand scratches or am i up for a battle to get it to stick? In years past I have always used self etching primer, should I just stick with that? I could not find anything on manufacturer googling (Matrix Epoxy)
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Re: epoxy primer question
You have to wash it down with vinegar or leave it in the rain to neutralize it before it can be painted. I don’t know about epoxy call SPI they can tell you, they have a great product
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Re: epoxy primer question
I've seen lots of galvanized painted...and it never sticks....maybe there is a secret....
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Re: epoxy primer question
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Re: epoxy primer question
Having left it outside is the reason you didn’t have a problem
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Re: epoxy primer question
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Thanks |
Re: epoxy primer question
wash the sheetmetal with water born degreaser to get the oils out ,after you dry it you can sand it to create a tooth for the epoxy to adhere ,but you can also use vinegar instead of sanding ,the vinegar is a acid and will create etching in the sheetmetal so the epoxy primer will adhere, this method has been used for a very long time . leaving it out side will will do nothing but make it in to a used old sheet, witch will eventualy wear the zinc in the sheet away and after a point in time the sheet will start rusting .
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Re: epoxy primer question
Vinegar neutralizes the galvanizing it is not going to etch the metal enough to form a tooth at least not in a reasonable length of time. The reason for leaving it outside is to let it get rained on that is what neutralizes the galvanizing not just sitting out in the sun for decades
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Re: epoxy primer question
There isn't a vehicle made with steel panels today that doesn't use galvanized. Every paint system has the correct primers and metal treatments for galvanized materials. There are some subtle differences in types of galvanized surfaces though. Most automotive will be a wipe coat that has a smooth surface. The type of metal jn a grain bin or your furnace ducting is quenched and has an uneven surface and appearance.
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