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Old 05-04-2007, 02:44 AM   #1
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Default Curing high temp paint on exhaust manifolds prior to install

What temp and how long in the oven?
I painted a couple sets of PEM'* up the other day and two days later after sitting in the sun all day for the past two days, the one set I still have here is not curing up.
On the other sets I've painted I've always shipped out or installed when they were 99% cured, but never had a set sit around like this to find the paint is not curing.

BTW, the paint is Plasti-Kote 1500* Exhaust Header paint.

Any tips would be appreciated.
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Old 05-04-2007, 09:15 AM   #2
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Strip the paint off. It'* useless. It will still cook right off those manifolds. Trust me, I've done it twice.
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Old 05-04-2007, 10:05 AM   #3
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I've done it as well. That paint starts flaking off in a week unfortunately, whether it'* cured or not. You need this:
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Old 05-04-2007, 11:11 AM   #4
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Yup. That'* the one and only DIY product worth the time and effort.

http://www.bonnevilleclub.com/forum/...ic.php?t=54055

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This stuff held up to the vice at the exhaust shop while I was getting the cracks in my crossover welded up:





In fact, I first applied it in May of last year. 2 months ago, when I removed them to 'freshen it up', I tried to remove it or at least scuff it with a wire wheel on a die-grinder. Let'* just say I met with total and utter failure in that attempt, and re-coated over the old stuff (which was still in great shape, even after scraping past everything during removal), and the end result came out great as you can see from the pics above. Testing is in the first link posted.
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Old 05-04-2007, 11:53 AM   #5
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well you raised my curioiusity with this since I am doing pems and it looks like it will be the following weekend before I get any work done. would it be thought feasible to coat it and let them hang for a little while then heat gun them. After you get the stuff to set up slightly recoat it and heat gun again then install and let the exhaust do the final curing. I am looking to Reduce KR with this mod and if I can do that and cool the engine bay it seems like it would be a double winner.also while I would be reinstalling the pems would coating the DP be of any advantage or waste of time and product. also how would it hold up to a harsh mountain winter like I have here
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Old 05-04-2007, 11:57 AM   #6
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Should I repaint the PEMs you sent me?
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Old 05-04-2007, 01:34 PM   #7
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At the risk of being castigated here, I'll speak up to say that I've been fine so far since using just the spray-on 1500* paint from Advance on my PEMs. But here are the caveats before I get scorched (pun intended) with replies:

- I painted mine in October 2006, so there'* still limited feedback time.

- I had very clean sandblasted PEMs to start with.

- I only used one regular coat and did not try to create a thick coating at all.

- I did not bake mine on at all. Just sprayed on, dried for 30 minutes and popped on the car.

- I was not after anything other than a temporary cosmetic coating. Anything looks better than the red ruster. And hoped for maybe more than a tempoary coating.

- Mine is only an SE and will likely never see the heat levels that most of the SSEi'* have.

But, all that having been said, they look as good today as they did when coated. No peeling, fading, or burn off noted yet.

Of course I don't even pretend that this is in the same league as the coating pictured above, because it'* not. It'* purely cosmetic.
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Old 05-04-2007, 02:05 PM   #8
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Quote:
Originally Posted by lash
- I had very clean sandblasted PEMs to start with.
These were sand-blasted and then ceramic coated. Followed by the paint, so the paint is on the ceramic, where I'd expect due to the roughess of the ceramic, the paint would have more 'staying power'.
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Old 05-04-2007, 02:33 PM   #9
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Quote:
Originally Posted by gojo83
well you raised my curioiusity with this since I am doing pems and it looks like it will be the following weekend before I get any work done. would it be thought feasible to coat it and let them hang for a little while then heat gun them. After you get the stuff to set up slightly recoat it and heat gun again then install and let the exhaust do the final curing. I am looking to Reduce KR with this mod and if I can do that and cool the engine bay it seems like it would be a double winner.also while I would be reinstalling the pems would coating the DP be of any advantage or waste of time and product. also how would it hold up to a harsh mountain winter like I have here
If you clean them well it may work.

When I did mine (while on the car) I didn't get them as clean as I could have. The directions actually say to apply only one thin coat, not two. But I didn't get the best coverage with only one.
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Old 05-04-2007, 02:41 PM   #10
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Gojo83, you can paint the down-pipe, but like they said, unless it is perfectly clean (might even take some 220 grit sand paper to it to roughen it up), the paint will not stick. As far as the benefits of it... I don't know of anyone who'* done it here.

Quote:
Originally Posted by J Wikoff
Should I repaint the PEMs you sent me?
It might not hurt... I forget what I used on yours.... IIRC it was a VHT header paint.
It probably would be a good idea fwiw.
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