SOHC.co.uk Forums > CB500/550
Engine Painting Disaster - Help!
Neilw:
I have prepped the top end of the engine, primed with etch primer and given three light coats of VHT Silver. So far everything looks great, have also done the bottom end.
Today I loaded the top end bits into the oven and baked for 60 mins at 200 degrees as per instructions on the can.
When i opened the door, smoke poured out. I assume now from oil from the head, as I left the tappets in.
This has resulted in all the silver bits coming out a golden colour! I've also got a small amount of blistering on some parts.
The bake seems to have worked as the paint is hard, but the colour is wrong!
How do I recover the situation? I plan to key the paint somehow ( ideas on how, please?) and apply a couple of fresh coats of paint? and then either bake again individually, but forget doing the head and let that cure on the bike when the engine gets hot.
Any other ideas or thoughts, please. It took a lot of work to get to this stage, and I'm gutted it hasn't come out as i had hoped.
I don't want to put the golden colour on the bike, as i have to touch up the blistered bit with silver, so it will look patchy!
McCabe-Thiele (Ted):
I thought VHT paint is applied directly, is the etch primer heat resistant?
Not sure what you mean by leaving the Tappets in?
Have you melted the valve guide rubbers?
Neilw:
--- Quote from: McCabe-Thiele (Ted) on June 13, 2026, 09:29:52 PM ---I thought VHT paint is applied directly, is the etch primer heat resistant?
Not sure what you mean by leaving the Tappets in?
Have you melted the valve guide rubbers?
--- End quote ---
I had removed the valves, rubbers, etc., and it can have primer and is heat-resistant.
McCabe-Thiele (Ted):
--- Quote from: Neilw on June 13, 2026, 10:39:30 PM ---
--- Quote from: McCabe-Thiele (Ted) on June 13, 2026, 09:29:52 PM ---I thought VHT paint is applied directly, is the etch primer heat resistant?
Not sure what you mean by leaving the Tappets in?
Have you melted the valve guide rubbers?
--- End quote ---
I had removed the valves, rubbers, etc., and it can have primer and is heat-resistant.
--- End quote ---
Reads as though oil or solvent has discoloured your paint?
Not sure what you mean by leaving the Tappets in?
Before I used our oven to bake my engine parts I used the Pyrotechnic Cleaning Setting on our oven to ensure there was no residual fat in my oven. Could be the bubbling be etch primer solvent not being fully dry? I also followed the temperature step guide for gradual increase of the baking temperature.
Neilw:
I think it's the oil in the rocker cover that has discoloured the paint. ( i meant rockers, not tappets) [ Guests cannot view attachments ]
I've given the breather cover a quick coat so you can see the difference between the two.
The only option I have is to give everything another coat and bake it separately. I guess a light rub with 400/88 grit should give a good key for the coat, unless anyone has a more informed idea of what I should do?
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