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Post by Harold on Jan 22, 2015 12:25:24 GMT
I know this is a topic we have discussed before but I saw an article in Classic Motorcycle Mechanic this month and Ian mentioned it in the Modern Petrol thread which brought it back to me. In it the guy who owns Briteworks describes how he prepares an engine with petrol, paint thinners and then rubs ( or etches as he describes it ) with wet and dry etc. before spraying it with Holts Simoniz paint, Satin Silver for Honda's is what he recommends. But what got me thinking was this, he does not mention prime etching or otherwise so does he just spray the paint directly on. If you think about it we put high temperature paint on because of the heat created by the engine but surely then any primer would have to be resilient to high temperatures as well and if not, would it not flake off taking the heat proof paint with it ?
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Post by grahamb on Jan 22, 2015 12:49:33 GMT
Hi Harold .
When I did my engine a couple years ago , I used simoniz also. Think it says on some brands no primer required. Looks good when first done, but the problem seems to be petrol spills stripping the paint off if your carbs flood or get any leaks.
Ended up removing all the simoniz off and redoing it with hycote engine enamel.
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Post by Harold on Jan 22, 2015 12:57:14 GMT
How has the Hycote worked out Graham and did you use primer ?
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Post by stevie on Jan 22, 2015 13:01:00 GMT
Harold a thin coat of etch will be ok, belt and braces kind of thing.
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Post by Deleted on Jan 22, 2015 13:02:51 GMT
It's worth noting that even the original paint did not last long at all - hence the belief by some that the middle crankcases were never painted from new.
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Post by grahamb on Jan 22, 2015 15:11:24 GMT
How has the Hycote worked out Graham and did you use primer ? I found it excellent . resists petrol and doesn't chip like others. As Stevie has said use an etch primer minimum , I spoke to hycote tech dept and they advise a product adhesion aid so I used that. My engine is black and any defects stick out , a couple of years on it's still fine. If I do get a stone chip I just spay a little into a lid and touch it up with a brush.
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Post by Harold on Jan 22, 2015 15:20:23 GMT
Sounds good to me Graham and if it doesn't work at least I can blame you, do you have a number for your complaints department just in case.
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Post by Deleted on Jan 22, 2015 15:25:56 GMT
Sometimes, although petrol damages a lot of this paint (although not Graham's hycote) we can use it to our advantage.
Petrol is great for removing overspray (as an example).
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Post by grahamb on Jan 22, 2015 17:16:57 GMT
Sounds good to me Graham and if it doesn't work at least I can blame you, do you have a number for your complaints department just in case. I'm not one to side step blame, but Loz recommended it to me, That's LOZ the one from Doncaster . He is also the forum complaint co-ordinator . Be gentle with him though , he's not as young as he was .
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Post by scania on Jan 22, 2015 20:05:20 GMT
I always associated the word 'etch' with acid as a cleaning agent to be later washed off as soon as the material is clean, I remember years ago training in chip manufacture with intel where we etched silicon with acid,(very unhealthy environment to work in so I got out of that). So does one wash the etch primer off with petrol or thiners or something before applying the Hycote. Also is the general agreement that Hycote is better than Simoniz?
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Post by stevie on Jan 22, 2015 20:18:00 GMT
Acid etch primer can be bought in aerosol cans, the primer bites in and etches itself to the bare metal thus creating a surface that your paint can stick to. You should allways etch primer most bare metals and alloys to be painted as it helps resist chipping and flaking and it has anti corrosive properties as well, hope this helps
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Post by stevie on Jan 22, 2015 21:08:04 GMT
To see what i am talking about, try painting some bare metal in your run of the mil aerosol paint, let it dry then stick some masking tape to the paint then pull it off, your paint will probably be stuck to your tape and not the bare metal. Now etch your metal then spray a coat of paint over the etch, leave to dry then try the masking tape again, hopefully it will stay stuck to the metal and not the tape
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Post by revver on Feb 2, 2015 21:27:27 GMT
i used simoniz on my triumph and spilled petrol on it, it came off, wouldn't use it again. im going to try the smoothrite paint, rich had it on his bike and said it was holding up ok.
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Post by scott on Feb 2, 2015 22:53:11 GMT
it does say on the tin that simoniz needs to be baked in the over to be solvent resistant, but even then petrol fetches it off in seconds. Hammerite isn't much better either.
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Post by Deleted on Feb 2, 2015 22:55:54 GMT
The golden rule - don't spill petrol on it!!!!!
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