Powder Coating overspray: help needed

JustJeff · 06-20-2011, 10:21 AM

Got parts back from powdercoating and there was some overspray on gasket surfaces and a couple gasket areas that they didn't mask off at all.

I'm thinking sand this down best possible and use some RTV sealant on both sides of the gaskets?

I didn't get pics of it, but I have heavier overspray on the throttlebody side of the UIM. IIRC the plastic modling between the UIM and TB doesn't use any kid of sealant and the tiny holes for vacuum lines will make using RTV tricky.

They didn't cover the turbo oil outlet port or oil cooler port (inlet??) at all:

Can I simply gasket the surface?

Oil cooler I'll have to clean up some. To make sure it seals, can I simply put some RTV on it and tighten down the hose adapter?

They also missed the BAC area on the UIM. I'm thinking I'll be ok using some RTV

mazdamikes · 06-20-2011, 11:16 AM

You can try using a razor blade or sanding will take it off.As for the threaded holes that didn't get plugged you will want to run a tap or thread chaser in them.

My5ABaby · 06-20-2011, 12:44 PM

Or send it back to them and tell them to not suck and fix it...

djmtsu · 06-20-2011, 12:52 PM

What Robert said.

I would take them back and have them strip and re-coat it. Powder coat is a major PITA to strip, and it is their mistake......unless you didn't specify the importance of where it needed to be masked.

JustJeff · 06-20-2011, 01:40 PM

Taking it back to them isn't an option at this point. It took them 2 months to finish the work. Unfortunately it sat in the owner's office while he was out of town. I imagine what happened was the guys doing the work forgot some of the instructions I left with them. On the plus side they gave me a huge discount on the price.

I want to assemble the engine this weekend...pending some bearings being pressed correctly. I'd rather clean it up myself than have the assembly delayed.

The turbo outlet passage is real clean. I'd think some RTV and a gasket will seal it. My concern is whether the oil will eat away at the powdercoating. Over time will it end up leaking?

Obviously the oil cooler passage can't stay the way it is.

The threads, studs, holes, etc. have cleaned up pretty easily so far. So far I've been able to run a bolt down them without stripping anything and use a wire brush to clean up the debris in the threads.

My5ABaby · 06-20-2011, 01:43 PM

You have terrible luck with shops.

tweiss3 · 06-20-2011, 01:51 PM

use the razor blade trick to clean it down to bare metal

JustJeff · 06-20-2011, 03:38 PM

Quote:

Originally Posted by My5ABaby

You have terrible luck with shops.

Tell me about it!! I guess that's the product of living a pretty rural midwest. I've learned to do as much work as possible, not only out of personal pride, but for sheer survival!!

Quote:

Originally Posted by tweiss3

use the razor blade trick to clean it down to bare metal

clean up the turbo outlet port also?

FerociousP · 06-20-2011, 04:13 PM

Quote:

Originally Posted by JustJeff

Tell me about it!! I guess that's the product of living a pretty rural midwest. I've learned to do as much work as possible, not only out of personal pride, but for sheer survival!!

clean up the turbo outlet port also?

You might as well... Even if you cleaned a 1/2" outward of the circle in the middle, you'd have plenty of gasket material... dremel sanding drum??

*** That particular area doesn't see any pressure, so the gasket material doesn't have to be so "Robust". A stock gasket with black RTV would seal no prob.***

Garfinkles Motor Works · 06-21-2011, 12:31 AM

Clean to the metal under any gasket ,no gouges, light sanding proper gaskets and sealer . No power coat .Ask me how I know .Take no chances do I correctly the first time,My customers know that is what they will get .

***TitaniumTT*** · 06-21-2011, 08:05 AM

Check the seals and operation of your TB.... chances are it was ruined by the heat and won't hold pressure anymore.

JustJeff · 06-21-2011, 08:55 AM

Quote:

Originally Posted by TitaniumTT

Check the seals and operation of your TB.... chances are it was ruined by the heat and won't hold pressure anymore.

I didn't have the TB powder coated, but there is some overspray on the UIM to TB studs.

06-20-2011, 12:44 PM	#3
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (6) Posts: 2,377 Rep Power: 19	Or send it back to them and tell them to not suck and fix it... __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

06-20-2011, 12:52 PM	#4
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	What Robert said. I would take them back and have them strip and re-coat it. Powder coat is a major PITA to strip, and it is their mistake......unless you didn't specify the importance of where it needed to be masked. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

06-20-2011, 01:43 PM	#6
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (6) Posts: 2,377 Rep Power: 19	You have terrible luck with shops. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

06-20-2011, 01:51 PM	#7
tweiss3 Mazda Lover Join Date: Aug 2010 Location: Akron, Ohio iTrader: (0) Posts: 319 Rep Power: 15	use the razor blade trick to clean it down to bare metal __________________ 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles

06-21-2011, 08:05 AM	#11
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Check the seals and operation of your TB.... chances are it was ruined by the heat and won't hold pressure anymore. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

06-20-2011, 11:16 AM	#2
mazdamikes The Newbie Join Date: Feb 2008 Location: Milwaukee iTrader: (1) Posts: 20 Rep Power: 0	You can try using a razor blade or sanding will take it off.As for the threaded holes that didn't get plugged you will want to run a tap or thread chaser in them.

06-21-2011, 12:31 AM	#10
Garfinkles Motor Works RCC Contributor Join Date: Mar 2008 iTrader: (11) Posts: 535 Rep Power: 17	Clean to the metal under any gasket ,no gouges, light sanding proper gaskets and sealer . No power coat .Ask me how I know .Take no chances do I correctly the first time,My customers know that is what they will get .