jackso11 Posted September 23, 2010 Share Posted September 23, 2010 I am going to start polishing bits of my engine, just for myself not as a service I have plenty of tutrials, instructions and have watched youtube vids on how to do it. Looks very time consuming but that is fine My question is, when I have polished parts like the turbo heat shield that are pitt over time and rust, how do I seal them? Do I need a sealing polish of some kind and then just regular rag polish? Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted September 23, 2010 Share Posted September 23, 2010 you will never ever remove all the pitting from the heatsheilds unless you go brand new or get it chromed, they are a nightmare and have a special coating on them. as for sealer just keep ontop of stuff with meguires nxt acts as a good sealer, also a good going over with autosol first will bring the finish up better. Quote Link to comment Share on other sites More sharing options...
jackso11 Posted September 23, 2010 Author Share Posted September 23, 2010 Cheers mitch I have a spare heatshield on its way to me as a practise piece If it doesn't go well I will powdercoat it black I think. I will get that pipe to you this weekend too Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted September 23, 2010 Share Posted September 23, 2010 cheers. Quote Link to comment Share on other sites More sharing options...
Robzki Posted September 23, 2010 Share Posted September 23, 2010 powdercoat may not be the best thing on a heat shield. Quote Link to comment Share on other sites More sharing options...
jackso11 Posted September 23, 2010 Author Share Posted September 23, 2010 why not? I would think it should be fine at high temp. Quote Link to comment Share on other sites More sharing options...
Robzki Posted September 23, 2010 Share Posted September 23, 2010 I was under the impression that powdercoat was cured at under 400f therefore wouldn't have thought it would withstand the heat near the turbos. It is just my opinion though. There may be a heat resistant type, cured at a higher heat? Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted September 23, 2010 Share Posted September 23, 2010 I was under the impression that powdercoat was cured at under 400f therefore wouldn't have thought it would withstand the heat near the turbos. It is just my opinion though. There may be a heat resistant type, cured at a higher heat? Didn't Jamiep have this problem with powder coated parts in his engine bay? I remember the paint going brittle and falling off. On another note I have had my cam covers painted in regular paint (done in a body shop so went in the oven to cure), these are fine, no indication of perishing and they have been on for well over a year now. I think a lot of it is down to the preparation of the surface. I don't think that the heat shield would be suitable though as would likely get very hot as already stated. Why don't you just get everything bead blasted to restore the factory look of the car. I have been told before that the reason the surfaces are mottled is to better dissipate heat by increasing the surface are. Seems logical!? Quote Link to comment Share on other sites More sharing options...
Robzki Posted September 23, 2010 Share Posted September 23, 2010 Why don't you just get everything bead blasted to restore the factory look of the car. I have been told before that the reason the surfaces are mottled is to better dissipate heat by increasing the surface are. Seems logical!? I'd always thought that, I know on the classic bikes that its a big NO to polishing the cylinder fins as they are designed dissipate heat, ie larger surface area. Doubtful that the intake pipes are subject to such extremes but every little helps. I think its really just a personal preference. I would have thought a ceramic coating would be the way to go on the heat shield. VHT paint never seems to last long. I was only looking at mine yesterday and thought about having a stainless one made up as it does look tatty Quote Link to comment Share on other sites More sharing options...
jackso11 Posted September 23, 2010 Author Share Posted September 23, 2010 Yeah you are right about curing powder coat, its about 230-260 Dec C. Once cured though powder coat is bonded to the surface and can withstand very high temps. There shouldn't be a problem with anything being powder coated in the engine bay. Quote Link to comment Share on other sites More sharing options...
colsoop Posted September 23, 2010 Share Posted September 23, 2010 Think long and hard about blinging your ewngine bay. it is a commitment to keep it looking good. A decent metal polish to clean parts, apply it with a soft cloth. I used to seal my parts with a good carnauba wax, but alloy wheel sealant will be quite hard wearing and should hold up well. regular cleaning is a must though. What parts are you looking to polish ? you will never ever remove all the pitting from the heatsheilds unless you go brand new or get it chromed, they are a nightmare and have a special coating on them. as for sealer just keep ontop of stuff with meguires nxt acts as a good sealer, also a good going over with autosol first will bring the finish up better. They are made of tin IIRC and are double skinned. You can remove the pitting from them if you start off abrasive first. They used to take quite a bit of time to get a good finish though. I wouldn't bother personally unless you are chroming it as it will rust so quickly. As for powdercoating the heatshield it is too close to the turbo and it will burn ther powdercoat. Quote Link to comment Share on other sites More sharing options...
Hoppy Posted September 24, 2010 Share Posted September 24, 2010 Regarding powder coating. We powder coat coil springs in work. The powder paint we use cures at around 180 degress (+/- 15 degress). When we need to strip the powder coat off, we put the coils through a oven at 325 degrees. This temprature totally destroys the powder paint finish. So i would'nt say powder coating a heat shield would be a good idea. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted September 24, 2010 Share Posted September 24, 2010 powder coating = bad with heat chroming= good and looks sweet Quote Link to comment Share on other sites More sharing options...
Hoppy Posted September 24, 2010 Share Posted September 24, 2010 Mitch, any idea on what sort of temps chrome can resist mate? i've been wondering this for a while. Quote Link to comment Share on other sites More sharing options...
Suprab1 Posted September 24, 2010 Share Posted September 24, 2010 I am going to start polishing bits of my engine, just for myself not as a service I have plenty of tutrials, instructions and have watched youtube vids on how to do it. Looks very time consuming but that is fine My question is, when I have polished parts like the turbo heat shield that are pitt over time and rust, how do I seal them? Do I need a sealing polish of some kind and then just regular rag polish? Any links to the youtube vids? As i need to polish the lips on my alloys because they have a bit of corroison. Think long and hard about blinging your ewngine bay. it is a commitment to keep it looking good. A decent metal polish to clean parts, apply it with a soft cloth. I used to seal my parts with a good carnauba wax, but alloy wheel sealant will be quite hard wearing and should hold up well. regular cleaning is a must though. What parts are you looking to polish ? Where can i get alloy wheel sealant? Quote Link to comment Share on other sites More sharing options...
colsoop Posted September 25, 2010 Share Posted September 25, 2010 Mitch, any idea on what sort of temps chrome can resist mate? i've been wondering this for a while. It is approximately -50 to 400 degrees c . Where can i get alloy wheel sealant? Any shop that sells car detaling supplies. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted September 25, 2010 Share Posted September 25, 2010 (edited) yeah goes very very high in temerature, chroming is just the best... its my friend chroming heat sheilds is the only best way to go, chromed mine and its quality, easy to clean and good with heat. as mentioned before think real hard about doing the engine bay, i dedicate hours cleaning most bits. Edited September 25, 2010 by Rob_Mitchell (see edit history) Quote Link to comment Share on other sites More sharing options...
Dave Posted October 2, 2010 Share Posted October 2, 2010 have a look on here mate, ive got the blackfire for my alloys its very good http://www.polishedbliss.co.uk/acatalog/blackfire-all-metal-sealant.html Quote Link to comment Share on other sites More sharing options...
jackso11 Posted October 5, 2010 Author Share Posted October 5, 2010 for anyone thinking of polishing engine parts......pay someone to do it! I did my first piece of polishing last week and it took forever with a drill, proper air tools is a must I think. My end result was not too bad but not as good as it could be by a pro. pics here... Quote Link to comment Share on other sites More sharing options...
suprab Posted October 5, 2010 Share Posted October 5, 2010 is it really that hard to do?? damn i was going to give it a go over the winter Quote Link to comment Share on other sites More sharing options...
jackso11 Posted October 5, 2010 Author Share Posted October 5, 2010 its not that hard on the easy to do bits, but to get a smooth finish in corners and awkward parts its very hard! Quote Link to comment Share on other sites More sharing options...
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