OzVMX Forum
Clubroom => Tech Talk => Topic started by: Bitten on June 25, 2011, 12:10:04 pm
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I know this old chestnut has probably been covered before but couldn't find what I wanted to know....
I have just rebuilt the engine and painted it with VHT satin Caliper paint as recommended on previous threads, The satin finish looked great until I cured it and it went a bit glossy, no bother.....now I have started to bolt it all back in the frame it chips really easily.
I was very meticulous when preparing, I had all the parts bead blasted, washed with PPR marine clean, rinsed thoroughly, did not contaminate the surface, sprayed 3 coats & cured for 1 hour in the oven as per instructions on the can and it chips just looking at it...#@#@$%$#@@!!!!
Some questions....
1. The can didn't say anything about priming / etching, was this my first mistake?
2. Is VHT Caliper paint the right paint for crankcases and brake backing plates
3. Is chipping this easy the norm?
4. Can you recommend another paint that works better?
5. What are the correct steps to doing it properly if the above is wrong?
Cheers and thanks in advance
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I'm not sold on the vht stuff. I reckon supacheap spraypacks work just as well if not better. An etch prime first helps no matter what you're using though.
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Hey Bitten, I have done the hubs, engine, exhaust etc on my IT465 and now the RM465 in "Plasti-Kote Woodstove". Bunnings and Mighty10 stock it. Lovely satin finish, when you bake it in the oven it doesn't change and is very durable. Warm it up in a sink full of warm-hot water before spraying and if goes on beautifully.
(http://i696.photobucket.com/albums/vv327/vtss5000/IMG_1410.jpg)
(http://i696.photobucket.com/albums/vv327/vtss5000/IMG_2023.jpg)
Adam
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Thanks guys
Sorry for my ignorance but do you need a special high temp etch primer? - I have a can of Acid etch 8 from the same company as Por 15 will this work on high temp engine parts
Adam this looks great and just the look I was trying to achieve and keep on!! - Would you mind letting me know what step by step preparation did you did?
Again thanks
Justin
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Looks good :D :D
BTW I am sick of paint that chips off when tightening screws up on the cases. Does Plastikote do this? VHT does as do others I have tried. Maybe the factories use a flex additive to the paint?
Also modern new fangled plastic boots seem to chew the crap out of the paint way worse than my old plain leather boots ever did - well my Sidi Crossfires do anyway. Make a new paint job look well used in about 2 rides! Guess we build em to ride and not look at ::) ::)
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Hey Justin,
I just used normal etch primer for aluminium etc. on the cases and hubs etc. I sprayed the exhaust with the Woodstove directly, no primer. Build it up in thin coats is the key with the Plasti-Kote paint, it sprays really nicely especially when warmed up in the sink. I had everything stripped to bare material to start, primer and top coat, then baked what I could fit in the oven - the misses cracked it though cause it took a day or two for the smell to go :-[. I did it all over a 2-3 week period giving ample drying time in between coats. I did nothing out of the ordinary, just have everything stripped back to bare material, good clean with wax and grease remover, then light layers and don't rush it. I have a rack in front of the gas heater now to bake the bits to keep the boss happy ;). I use the Plasti-Kote Woodstove for all the satin black jobs now.
Cheers
Adam
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PEZBerg,
yes the boots have rubbed the paint off the clutch cover a bit on my IT, probably not much you can do about that. I have found though, that if I just look at the bike and not actually ride it, it is not getting any worse ;D. I try and use a flat washer under the nuts and bolts where possible to stop the chipping. That Plasti-Kote builds up quite thin so it isn't as bad for chipping where you can't run a washer I have found.
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Off to Bunnings I go for some plasti cote
Thanks!
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Can you post a photo of the 'cracking' or is it more like 'crazing'?
Im not sure if VHT caliper paint is different to VHT barrel/case paint but i always use VHT barrel satin black and never had a problem.
If the surface is beadblasted and clean, you dont really need a etch primer but it doesn't hurt to use one. I dont really use primer on motors unless its a steel barrel or head but i use it on alloy hubs when using proper acrylic or 2 pac out the spray gun.
You may have baked it in the oven too much or if the paint was too thick it has cracked because when you heat the cases they expand. I never bake the VHT barrel paint. Theres no need to. It will dry naturallly and when you start the engine it will bake.
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Is that stove paint petrol proof ?
The VHT caliper stuff aint !
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I have had petrol on VHT engine paint and it does not affect it. it might if you left your clutch cover or something in a container of petrol over a few days though but a few spashes wiped off right away wont hurt it.
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What Leith said goes for the Woodstove paint as well.
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Hi all
I chased around a few Bunnings and Mitre 10 stores yesterday afternoon to no avail and rang Plasti-Kote this morning and was told that these product are not being made anymore and are no longer available, so I may have to try the VHT barrel paint
To answer the other questions I baked the caliper paint for 1 hour at 100 deg c as per the instructions, the paint isn't cracking but if you bump it slightly with a spanner or whilst installing it (the brake plates) it just chips really easily.
Adam, a question on the etch primer, does this need to be a high temp version one or can any etch primer do?
Cheers
justin
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use any quality spray then put in the oven (the girls love that) at 80 odd deress for couple of hrs,leave in oven to slowly cool,have had no trouble over 30yrs.
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Bazza my long suffering wife is very understanding!!
I will let you know how I get on
cheers
Justin
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Hey guys to stop the the misses complaining and complaining use the barbeque instead of oven.If you have a barbeque with a hood that is..The trick with any baking on the barbeque is to use the outer burners only.Put your roast or engine part LOL in the middle of the barbeque on a roasting rack and turn the outer burners down to the lowest they can go.This should give approx temp of 100 deg. I say you should test temp 1st as I assume it would be important not to get barrels etc to hot.
Happy barbequeing
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I usually use VHT flame proof paint. I figure the higher the temperature rating the better. I wouldn't use the caliper paint. A thin dust coat first up, and follow with light coats. The barbecue idea is a beauty. Don't know why I never thought of that, sometimes the simplest solutions escape you.
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bitten im sure she will love it...lol
Just bought a TL250 as i have no projects and i will spoil Carol and use the oven as usual
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So far I have bent 3 meat thermometers trying to get the temperature right, any tips?
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I had the same problem, however I noticed the chipping was only taking place on the clutch cover and the stator cover and no where else, therefore just on the magnesium parts (note: I didn’t use any primer). I pulled them off, striped the paint off then primed them and painted and no more problems. Just used a normal etch primer i.e. not heat specific.
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Just a quick update
After searching for Plasti-Kote Woodstove as recommended by Adam and told it is no longer being brought into Australia I discovered it is made by a company called Valspar who are the parent company of Wattyl paints. I do a lot of work for the very good people at Wattyl and I was in a marketing meeting yesterday and casually asked the question about Plasti-Kote Woodstove and was told that yes it was deleted BUT they are about to launch a new range of Killrust heat resistant paints in August and whilst they could not put their hand on their hearts and say it was the same formula they threw me a can of the new Killrust Woodstove to try!!
I raced home and last night prepped, primed and painted the brake backing plates and cured them until 1am and they have come up a treat - the right satin finish and they look to be a lot more durable than the VHT caliper paint (not sure if it was the paint or primer)
Anyway a good ending but be warned it DOES stink up the house and my wife is not that understanding any more!!
Thanks for the tips especially the BBQ one!!
Cheers Justin
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(http://i323.photobucket.com/albums/nn458/mx250syd/icons/wwp.gif)
Interesting 8).
It would be interesting to see how it compares to Powder Coating.
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Well done Bitten!. Hope the barby was good?.
The problem now is when can us commoners get a can of this stuff?
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around August it will be released into the trade