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Old 08-05-2005, 09:41 PM
gmwillys
 
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what primer?

This is my first posting, and I don't know what I'm doing, so bear with me.
My problem. I sandblasted my sheet metal and did my body work and plastic skim coat over the bare metal. From what I read on this site, I should have primed before body work with epoxy and worked from there. But to late now. I'm not going to do it over. So what to do? The fenders are 25% bare metal and 75% plastic. What do I use for primer at this stage?? I will overcoat with k2 and paint with chroma 1. Thanks for any help. [I hope this posts OK]

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Old 08-05-2005, 10:21 PM
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cover with an epoxy primer, it will be ok
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Old 08-05-2005, 10:29 PM
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You should be fine. You can apply filler over baremetal. Many people do it this way. As long as there were no holes at all where you applyed plastic filler over in which water could reach it. Plastic fillers absorb water. Just epoxy after you have it straight, then apply a urethane filler primer. I personally grind where I apply my filler when going over baremetal, but I think you will be okay applying it if the surface was sandblasted. Others will give their opinions. I've applied filler both ways, over epoxy and over bare metal.
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Old 08-06-2005, 07:40 PM
gmwillys
 
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Thanks for info. I was not sure about epoxy over plastic, and was concerned about the bare metal not being clean enough after sandblasting only.
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Old 08-06-2005, 09:44 PM
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Body filler loves to adhere to a freshly sandblasted surface! As far as the primer to use, each paint manufacturer will have their own recommendations. At my shop we tend to like a thin coat of acid etching primer over the bare metal areas only, then several coats of acrylic urethane primer over all.
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Old 08-07-2005, 08:05 AM
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Two good complete coats of epoxy primer followed by a urethane or polyester primer surfacer and you'll be ready to block sand.

Some prefer self etching primers over bare steel but some etch primers are not suggested for use over sandblasted metals. Epoxy would be my choice and will provide excellent adhesion to sandblasted or sanded metals. Just make absolutely sure your suface is clean prior to applying that first coat of primer, I wipe until no discoloration shows up on a towel.
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Old 08-07-2005, 06:44 PM
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Also be aware that some epoxies recommend a metal conditioner directly prior to application, and metal conditioners CANNOT be applied around body filler, so if you use an epoxy, use one that is made for "direct to metal" without any etching treatments.
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