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Old 04-16-2004, 10:42 PM
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Urethane and Epoxy Primers

I would like to know if there are any significant differences between a 2 part epoxy primer and a 2 part urethane primer? The reason I ask is that I will be doing some fiberglass to metal bonding and Fusor states to use a 2-part epoxy primer applied to both bonding surfaces for proper adhesion. I ordered the roll-on primer kit from http://autobodystore.net/Merchant2/m...Category_Code= which includes the U-POL 20:20 high build urethane primer. My car will ultimately be finished with the HOK paint system and their primer is an epoxy base (I know, I should've just ordered this epoxy). Would I be alright using a urethane, instead of epoxy, primer as my bonding surface??

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Old 04-17-2004, 05:04 AM
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Epoxy and urethanes are a world apart.
The urethane will not work for what Fuzor called for.

The reason they want the epoxy is for adhesion strength
for the two different type panels your bonding together and corrosion protection on the metal part.

You would not have this with the urethane primer long term, short term it would work.
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