Champagning
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Help wanted, suffering a lot of champagning on the edges of panels lately, any tricks,tips or techniques on how to avoid would be welcome !
Can you elaborate a bit further? ‘Champagning’ isn’t a term i’ve ever come across before? It’s highly likely your referring to something I can help with, just using an unfamiliar term lol
Were theres a build up on the edge of panels , and when baked it pops and the blisters turn white when you try to polish them !
I had a feeling that was what you’d be referring too. Just wanted to clarify before I barrelled in with some advice! 😛
That can be caused by a number of things.
First thing i’d make sure it that when you complete each pass of the door you extend right past the edge of the door. You don’t want to stop each pass on the edge as this can lead to a build up
Secondly, You may just be applying too much material. Try dialling the fluid in a little and see if that helps.
Third, what temp are you spraying at? Also how long is your flash off period at the temperature? If all the solvent hasn’t escaped before your second coat this could contribute to this. Edges are particularly susceptible.
Are you baking the jobs? If so how quick do you turn the oven onto bake after applying the last coat of clear?
Thanks for your advice , no not baking them but the clear seems to bubble any way , if you are doing two doors together are you saying paint the first door extending past the edge then the second door extending past the edge ( surely this would give a lot of build at the edges ) or would’nt it be better painting 1 and a half doors then just spraying over the area thats left ?
What temperature are you spraying at? How long is your flash off in between coats? When i say extend past the edge, I just mean never stop a pass at the edge of a pannel. No matter which way you do it. I personally have long enough arms to do two doors in one pass with a slight side shuffle. Everyone has their own technique though, no right or wrong way.
What clear coat are you using?
If you can, it’s always best to spray as long of area as you can. Walking the whole side if possible. This is especially helpful when painting tricoats. Alternately, doing 2 doors, or a door and a quarter should help.
sherwin williams , about 20c , just cant seem to avoid gettin build at edges !
Sounds like too much material then. Dial the fluid control in a bit and see if that helps. What gun are you using? Have you got the correct setup?
Or too small of a fluid tip,causing you to go slower so you can get a good film build causing build up at the edges.I say put in a size bigger fluid tip and see what happens.I had that problem with Sikkens HS plus and a 1.3 in an rp,went to a 1.4 and never happened again.You could also up your air pressure to improve atomization vs.choking your fluid.Also to fast of a clear can cause the same thing,you have to hose it on to keep it wet,just my 2cents 😉
[quote=”Jayson M” post=22063]Or too small of a fluid tip,causing you to go slower so you can get a good film build causing build up at the edges.I say put in a size bigger fluid tip and see what happens.I had that problem with Sikkens HS plus and a 1.3 in an rp,went to a 1.4 and never happened again.You could also up your air pressure to improve atomization vs.choking your fluid.Also to fast of a clear can cause the same thing,you have to hose it on to keep it wet,just my 2cents ;)[/quote]
This is exactly what I would do also. Get a nice wet coat on instead of having to hammer a coat out of a smaller tip and having it build up on the edges. Let the reducer do the work and don’t fight the paint as much.
[quote=”part timer” post=22055] or would’nt it be better painting 1 and a half doors then just spraying over the area thats left ?[/quote]
That’s what he means. Don’t stop or make your overlap on a panel edge, do it a few inches into the next panel. Or better still walk the car and do the whole lot in one go 😉As others have said though, it sounds like you’ve got too much material going on in the first place. I’ve never had an edge champagne on me when the panel was air dried.
most definetly to much material, never use to get this in the days of medium solids, but i have seen it since the inception of high solids clears.
All good advice above if you vary your technique as mentioned you will avoid this without any further problems, try upping your pressure at the gun this will speed up the application process.
And will require less material application, some times if the pressure is too low you find yourself going slower and closer to the panel to gain a finish, this usually results in to much material being applied.
When i changed to high solids clear’s i found i had to change my technique, by upping the pressure by quite a margin, i use to paint with quite a low pressure and slow pass’s but that just does not work with the latest generation of clearcoats.
Thanks all for the advice , using gti with a 1.2 by the way , got some things to try now !
@ nick , I think ur probably right , I’m a bit old school, low ish pressure and slow passes so this proably is’nt helpin !
Any inlet pressure recommendations ?[quote=”part timer” post=22094]
@ nick , I think ur probably right , I’m a bit old school, low ish pressure and slow passes so this proably is’nt helpin !
Any inlet pressure recommendations ?[/quote]Minimum off 2bar 30psi at the gun you wont atomize high solids with anything less .
If you have a pressure gauge that attachs to the gun, always make sure the cheater valve is fully open before adjusting pressure on the gun gauge
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