a sometimes waterbase problem
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Hi i was reply on another forum to a problem that sometimes happens with waterbase basecoats , it does not happen with solvent basecoats, so if you ever see this type of contamination, you will know the car has a waterbase coat.
Anyway though i would cut and paste the thread to here as well, just in case you have not seen this happen, and if you see it you will know what it is.
the thread as posted
the only problem we ever see with water basecoat is creeping on the edges, if for instance one is repairing a quarter or front fender at the wheel arch area, and the painter fails to get clearcoat on the back edge of the wheel arch and the clearcoat does not go quite as far as the base.
Then dampness can creep back from the base and under the clear.
This can also happen on doors if they are masked too tight around the aperture as the clear fails to pass the base.
An example is shown below of how it looks when this happens, this was repaired elsewhere and came to us under a warranty repair luckily for the customer.
We have done a few of this model of car the main problem here seems to be the bumper fit that tightly to the car, it actually touches, and if someone has assembled the car to quickly after paint, you are in danger of breaking through the clear as the bumper is clipped in.
It is then a slow process of contamination as the panel absorbs the moisture
The base contamination always goes this way what ever the colour, the contaminated area goes a kind of dark blue
[IMG]http://i421.photobucket.com/albums/pp299/dunsdale/corsafault.jpg[/IMG]
A helpful post Nick, and that effect is something I’ve seen a lot.
Many people think the car has had a bad touch up job on an edge or something, until I explain.
By the way, if you know of a UK based painting forum then I’d be glad to hear about it. PM me if you’d rather 🙂
[quote=”Andy T” post=23855]A helpful post Nick, and that effect is something I’ve seen a lot.
Many people think the car has had a bad touch up job on an edge or something, until I explain.
[/quote]
That is what i thought it was the first time i saw it lol
i dont think there are any uk forums i started one years ago but very low usage, even though it was advertised in body repair mag
why the need for a uk based forum when you’ve got global right here 😛
[quote=”ding” post=23861]why the need for a uk based forum when you’ve got global right here :P[/quote]
:cheers
I imagine that is bascally the same problem we have here with stone chips that eventually make the clear peel like crazy around the stone chip (from moisture reabsorbing into the water base coat and lifting the clear).
Several of the paint companies have a hardener for the water base coat that is supposed to prevent this (makes the basecoat less susceptible to absorbing moisture when exposed)
Does your paint manufacturer offer something like this?
[quote=”ding” post=23861]why the need for a uk based forum when you’ve got global right here :P[/quote]
Oh, you know – product differences and stuff :whistle: It would never live up to this place though :rock
Ben – yes some manufacturers offer a hardener/activator, but I think Nick was just trying to illustrate and explain a particular problem that rears it’s head over here quite a bit, rather than seek a solution for himself.
Personally I’ve not had any of my jobs go that way, but I’ve had to repair plenty that have!
[quote=”Andy T” post=23908][quote=”ding” post=23861]why the need for a uk based forum when you’ve got global right here :P[/quote]
Oh, you know – product differences and stuff :whistle: It would never live up to this place though :rock
Ben – yes some manufacturers offer a hardener/activator, but I think Nick was just trying to illustrate and explain a particular problem that rears it’s head over here quite a bit, rather than seek a solution for himself.
Personally I’ve not had any of my jobs go that way, but I’ve had to repair plenty that have![/quote]
I haven’t had any issues either, but I have had to repair others, as well. The problem obviously exists, but I wonder if there is a little more to it that the base just not having hardener in it…
Not enough flash time between coats and stacking your coats to fast will contribute to delam.They are also reccomending 2 medium wet coats + drop coat instead of a super wet first coat to avoid this.Funny how things have changed since they started pushing waterborne here since late 2006/2007.
[quote=”Jayson M” post=23910].They are also reccomending 2 medium wet coats + drop coat instead of a super wet first coat to avoid this.Funny how things have changed since they started pushing waterborne here since late 2006/2007.[/quote]
I think this was more to do with the paint companys trying to bum up their products superior covering power.
It was a way to show how much better the product was compared to solvent base’s
when a high end solvent would cover in two coats in most instances.
i haven’t had this issue either, looks more like a rock chip or some one didn’t seal the part prior to painting, or just a missed spot durring prepeing.
[quote=”lild” post=23927]i haven’t had this issue either, looks more like a rock chip or some one didn’t seal the part prior to painting, or just a missed spot durring prepeing.[/quote]
No i have not seen this happen with rock chips, it happens on edges when there is not enough clear, or the clear has been broken on assy.
The reason it happens on edges is not helped by the fact that is where the rain water sits the longest, opposed to a flat area like rock chips further up a hood or fender etc
iv been spraying water base since 1994 glasurit ici standox ,and standox does have a activator to put in there water base .its suppose to make there water base harder drying ,especially there dark colors.Never used it my self ,never hat-to.
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