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Old 04-12-2010, 12:53 PM
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Epoxy primer. Is it needed??

I have blasted the paint from my project. No rust. Do i need to use an Epoxy primer or can I just go straight to 2k PRIMER. I am not driving the vehicle. It will be painted before it leaves the shop. All help is appreciated.

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Old 04-12-2010, 01:07 PM
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Absolutly, wouldn't go without it. The 2k isn't meant for bare metal.
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Old 04-12-2010, 02:10 PM
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you need some form of a Direct to metal primer.. most use DTM epoxies, but there are some who use DTM Etch primers.. but you need somthing listed for use direct to metal bottom line
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Old 04-12-2010, 03:32 PM
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I've used 2K directly on metal for almost 20 years, with no problem. I know that today many companies offer specific "direct-to-metal" 2K primers. Just google for them.
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Old 04-12-2010, 06:18 PM
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I'm a cheap old man and the best bang for my buck is SPI epoxy.
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Old 04-12-2010, 06:31 PM
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You can buy etch prime in a spray can (cheap). I also have used 2k right over bare metal many times and I know there were no problems (a few of my good friends cars). Although in the shop when the paint is guaranteed for life I always use it. Especially on large areas.
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Old 04-12-2010, 06:37 PM
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I always use the epoxy specially if it is a long term project..cheap insurance against do overs..but hey you can do anything that you want...

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Old 04-12-2010, 08:43 PM
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Quote:
Originally Posted by Steve C 1964
I have blasted the paint from my project. No rust. Do i need to use an Epoxy primer or can I just go straight to 2k PRIMER. I am not driving the vehicle. It will be painted before it leaves the shop. All help is appreciated.
Do you need to? No. You don't .
Do you want to do your project using today's best technology? If the answer to that is yes then the answer to your question is yes, use epoxy primer first.
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Old 04-13-2010, 04:41 AM
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Quote:
Originally Posted by Old Fool
I'm a cheap old man and the best bang for my buck is SPI epoxy.
Same here ...Not only does it stick very well to metal but it can be sanded also, eliminating the need for any other primers
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Old 04-13-2010, 06:42 AM
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you live in AL=lots of rain and every morning heavy dew moisture collecting inside and outside of the car ...

epoxy is a 99.99+ moisture and air barrier to prevent rust!!!

today's 2K urathane top coats are pretty darn good moisture and air barriers...

so how do you plan to use the car when done needs to be known to give a response
trailer queen?
in the mud?

my $.02:
just about all the epoxies brands technical data sheets call for a cured film thickness of only 1.5 to 2.0 mils...
(a poly lawn leaf bag is usually 1.25 mils thick,,,kitchen trash liner bag is usually 1.0 mil thick for reference example,,,info is on the box)...
So,,,do contact your epoxy brand tech dept first to confirm you can apply alot more to be able to do some surface sanding...
(more epoxy applied affects/changes the catalytic reaction heat generated and how it gases off to determine the final cured physical properties)

if nothing else do some testing on some scrap first,,,some epoxies are a total beeetch to sand when cured....
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Old 04-13-2010, 08:00 AM
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Quote:
Originally Posted by red65mustang

if nothing else do some testing on some scrap first,,,some epoxies are a total beeetch to sand when cured....
I second that, and I would also add that not all epoxy primers are created equal........read PPG .

Vince
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Old 04-13-2010, 09:02 AM
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Thanks for the info. I will absolutly use Epoxy first.
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