• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Painting Problems with Oven Curing

londonboards

londonboards

Forum Sage
Past Site Supporter
I'm trying out some engine paints. I want to decide on a paint to use on the engine and all the black part. Then I can show the powder coating guys the exact shade and satin type finish I want so that they all match up.

I painted this caliper with VHT white undercoat and then a satin black top coat caliper paint. I waited for the wife to go shopping and cooked it for 30 minutes at 200 deg C.

P1070244.jpg


but it bubbled up on me on the flat machined surfaces. The white undercoat was not affected.

P1070239.jpg


I am wondering if I should have cured the white undercoat before spraying the satin black.

P1070240.jpg


P1070242.jpg


P1070248.jpg


Other than that, I really like the finish it gives. It became more satin through the curing process and is almost like the 35 year old part from my bike. LHS is painted one. RHS is the old bike part.

Greetings
 
i use the same VHT paint on my exhaust, always used it. i have never used the undercoat.just made sure the surface was spotless clean but roughed slightly.
run over it with a hot air gun,(not your hairdryer,(or your wifes!)) which gives it a sort of pre harden(!). then cure it properly on the running bike.
never had a problem with it flaking or not adhering properly.
 
A guess at what happened:
The undercoat hadn't dried/cured enough before the topcoat was applied, effectively trapping in moisture... which had to find a way out during the oven cure stage... resulting in the bubbling. :-k
 
I've used the black on brake parts with only a well curred coat of zinc chromate primer underneath. Never had an issue.

I'd say its definately the undercoat causing the issue.
 
Looks like top layer flashed too fast over it all and trapped in solvents that gassed out.

Paint was not completely dry before you gave it the heat.
 
You must log in or register to reply here.
Back
Top