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Author Topic: Primer on epoxy question  (Read 1578 times)

tigertiger

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Primer on epoxy question
« on: December 30, 2009, 01:23:53 AM »

I have a hull that has been treated with epoxy resin.

Will rattle can acrylic primer work on epoxy, or do I need a special primer?
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The Antipodean

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Re: Primer on epoxy question
« Reply #1 on: December 30, 2009, 02:01:21 AM »

I used an automotive spray/filler primer in a spray can on my tug and it held tight, the acrylics crazed and never fully set up on it.

I am sure the old pros here can give better advice though.
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Peter Fitness

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Re: Primer on epoxy question
« Reply #2 on: December 30, 2009, 02:49:14 AM »

I may be old, but I'm not a pro  :-) , however, I use an acrylic primer/filler over epoxy resin with good results. I rub the epoxy down well with wet and dry to give a good key, and the paint adheres well.

Peter.
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The Antipodean

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Re: Primer on epoxy question
« Reply #3 on: December 30, 2009, 02:51:38 AM »

I would guess my crazing would be because I didn't sand enough.
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boatmadman

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Re: Primer on epoxy question
« Reply #4 on: December 30, 2009, 08:58:11 AM »

I have used car rattle can primer on epoxy many times with no problems.

 :-))
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tigertiger

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Re: Primer on epoxy question
« Reply #5 on: December 30, 2009, 01:47:46 PM »

Cheers chaps  :-))
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Bunkerbarge

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Re: Primer on epoxy question
« Reply #6 on: January 02, 2010, 10:59:23 PM »

Some epoxy resins contain a wax that rises to the surface to exclude oxygen to enable the curing process.  I know there are many out there with a more comprehensive explanation than that but the result is that you can have a waxy residue left on the surface of the resin.  Crazing is a classic effect if you don't deal with this wax as the paint 'floats' on the wax.

You need to thoroughly degrease with something like thinners and preferably give a good key by a rubbing down with wet and dry before using the rattle cans.  If you do that the paint should adhere perfectly well.
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