Reaction

[Championship White]

I'm getting a reaction with U-Pol Etch on a tester patch where I have sanded through to bare metal in places, the same area also reacts with zinc primer and high build 1k primer. I'll take some pictures tomorrow but until then then way I can describe it is like erratic pencil lines in the primer.

Will a bar-coat fix this? What could be causing it? And how is best to apply the bar coat?

 

[paintpot]

sounds like water in your air line.that's what usually leaves erratic pencil lines.

 

[Championship White]

Forgot to add, this was with aerosols.

 

[steveo3002]

sounds like it doesnt like whats underneath

you could either try very light dust coats or sand off the all the paint

 

[Chipper]

Is it the featherered edges reacting? Or is all all across the bare metal patch, or the old paint itself outside of the bare metal "hole". Pic would be best.

 

[Championship White]

It's the feathered edge I think. The panel I'm testing has been replaced due to crash damage and it was not a colour match so the previous owner, I think, sprayed it in the nasty Hammerite white paint to get a reasonable match. So could that be what is causing the erratic contour marks?

I bought some UPol bar coat to use on the small areas effected and will have to keep my fingers crossed that reactive paint wasn't used elsewhere.

 

[paintpot]

hammerite you need to strip the panel .that's were your reaction is ,its enamel'

 

[langy]

x 2 for sure

hammerite you need to strip the panel .that's were your reaction is ,its enamel'

 

[Championship White]

Are you saying barcoat won't work in this case?

Edit:Solved. It is the zinc primer reacting with the celly, phoned the zinc primer company and they comfirmed it is not compatible AND Hammerite on the front panel.

I'll stip the panel down with Hammerite on and sand off the zinc primer.

 

[FranV8]

I'm intrigued - what car is it? (Does it have a big red 'H' on it somewhere by chance?)

 

[Championship White]

Got one EK9 rally-car with a big red H, but this is a new EK4 ex-racecar that I'm converting to a rally car.

 

[FranV8]

I had to look those up - excuse my.ignorance! Very nice, any chance of some pics?

I run a rather stock FK2 as a daily driver!

 

[Tilly819]

Upol Barcoat

tilly

 

[Championship White]

I had to look those up - excuse my.ignorance! Very nice, any chance of some pics?

I run a rather stock FK2 as a daily driver!

Ah, when you said big red 'H' I thought you knew of my brother's car as it has a large vinyl 'H' on the bonnet. Here's an old pic of my brother's rally-car, it's covered in stickers now and looks totally different:

And here's one of the ex-racecar back when it was with its previous owner:

I've invested in some barcoat but have decided to paint the interior in enamel from Teamac (tractor paint) to avoid further reaction. Is there an enamel type high build primer or would that have to be a 2 pack? If that's the case I might barcoat it instead and use celly.