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Paint/Primer Quandry

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SamMI

04-22-2002 05:41:45




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Springs coming and need to paint (outside) implement parts. I've had the heavy parts sandblasted and primed at local contractor. He used Sherwin-Williams epoxy prime on these parts. I have de-rusted and wire brushed many of the smaller parts. I intend to treat these with "Ras-O-Nil", then prime with same SW epoxy primer. question is; Should I sand or scuff surfaces prior to painting with Acrylic Enamel using hardner or should I spray an additional coat of primer over the epoxy first? The heavier parts have been sitting in heated garage for several months so the epoxy primer should be really cured and hard. Thanks for all comments

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AR John

04-22-2002 16:52:19




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 Re: Paint/Primer Quandry in reply to SamMI, 04-22-2002 05:41:45  
I have been using john deere paint and thinner. I have mixed it according to directions. When I painted the tractor the temp was in the upper 50s or mid 60s. The tractor has been painted about 6 weeks and the hood and a few other parts have been painted about 3 weeks the small parts I have kept in where the heat is about 70. I have been putting the tractor outside now that the temps are in the 70s. The problem is the paint will not dry. When you feel of it it feels dry but when put pressure on the paint it wrinkles. Can anyone tell me what I have done wrong? Thanks john

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Kevin

04-23-2002 14:49:44




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 Re: Re: Paint/Primer Quandry in reply to AR John, 04-22-2002 16:52:19  
When you painted the temp was very cool.Chances are you didn't let each coat flash between coats.Now you got solvent traped under the top coat.It will take time but it should come out.J.D.thinner is very slow to flash.I use DuPonts (Dulux) line of reducers in J.D. paint along with hardener to speed up the drying time. I don't use J.D. paint on a regular basis .I try to stay away from the cheaper lines because of the problem you are having.

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Rod (NH)

04-22-2002 09:47:13




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 Re: Paint/Primer Quandry in reply to SamMI, 04-22-2002 05:41:45  
Hi Sam,

Generally, epoxy primer has a fairly short recoat period after which the manufacturer recommends sanding and the primer reapplied prior to topcoating. Each manufacturer may be different and I recommend you obtain the SW technical data sheet for the actual primer that was or will be used...and the one for the topcoat you will be using. You should be able to get them where you purchased the materials or from SW’s web site. For example, I use two epoxy primers; PPG DP40 and OMNI MP170. The DP40 requires topcoating after a 60 minute dry time minimum (at 70 deg F) and prior to one week, after which sanding and repriming is called for. The MP170 times for the same temperature are 30 minutes min and 72 hours maximum. I suspect that similar materials from SW will, in fact, be somewhat different...so you should get the appropriate data sheets for your materials in order to follow the specific instructions.

Rod

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Jerry B

04-22-2002 07:36:49




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 Re: Paint/Primer Quandry in reply to SamMI, 04-22-2002 05:41:45  
By all means sand, scuff or something to produce a textured surface for the paint. Sanding also removes surface dirt that can ruin a good paint job.

The advantage to epoxy primer (e Prime) is that it doesn't take days or weeks to cure, just a matter of several minutes to an hours depending on temp and humididty.

On the parts yet to prime and paint, get the parts ready to spray. Treat them with your Raz O Nil and let it dry according to instructions. When dry mix your paint and your primer. Spray the primer and then immediately spray your paint. It will be fine, I promise.

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Jerry B

04-22-2002 07:36:19




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 Re: Paint/Primer Quandry in reply to SamMI, 04-22-2002 05:41:45  
By all means sand, scuff or something to produce a textured surface for the paint. Sanding also removes surface dirt that can ruin a good paint job.

The advantage to epoxy primer (e Prime) is that it doesn't take days or weeks to cure, just a matter of several minutes to an hours depending on temp and humididty.

On the parts yet to prime and paint, get the parts ready to spray. Treat them with your Raz O Nil and let it dry according to instructions. When dry mix your paint and your primer. Spray the primer and then immediately spray your paint. It will be fine, I promise.

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