| Author |
Message |
Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5411
Location: Holland, MI
|
 Posted: Thu Nov 06, 2014 6:18 am Post subject: VHT Rattle Can On Cast Aluminum? |
 |
|
I would like to paint my cast aluminum fan shroud. I have had good luck with their engine enamel on steel but I have never really done much paint over aluminum before. Is any prep work or primer necessary or can I jus shoot it with some VHT rattle can paint and bake?
_________________
1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
|
| Back to top |
|
 |
Northof49
Samba Member
Joined: July 22, 2013
Posts: 1759
Location: Winnipeg, Manitoba, Canada
|
| Posted: Thu Nov 06, 2014 9:19 am Post subject: |
|
|
I only have experience with the VHT satin black epoxy and it holds up extremely well on bare aluminum. I painted the forks of my three wheeler around 4 years ago with it and there isn't a scratch on it, despite driving through brush and weeds.
_________________
1958 Karmann Ghia owner |
|
| Back to top |
|
|
raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
|
| Posted: Fri Nov 07, 2014 8:36 am Post subject: |
|
|
| Its worth a try. There are numerous threads on the STF from a while back with, different takes on painting/coating the shroud. The problem is the type 4 shroud is not just aluminum.....its an aluminum/magnesium alloy and does not take paint well. Ray |
|
| Back to top |
|
|
Mike Fisher
Samba Member
Joined: January 30, 2006
Posts: 17970
Location: Eugene, OR
|
| Posted: Fri Nov 07, 2014 9:37 am Post subject: |
|
|
Tram painted all my new engine except the air cleaner with spray cans & I am happy to show it off now!
_________________
https://imgur.com/user/FisherSquareback/posts
69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
two 57 oval ragtops sold
'68 Karmann Ghia sold
Society is like stew. If you don't keep it stirred up you end up with a lot of scum on the top! - Russ_Wolfe/Edward Abbey |
|
| Back to top |
|
|
Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5411
Location: Holland, MI
|
| Posted: Mon Nov 10, 2014 8:45 am Post subject: |
|
|
I wonder if an epoxy primer would adhere well to it. I have seen several nice paint jobs on them, but never know what they did to get it that way.
Can you use one kind of primer, say an epoxy primer, and then paint over it with another kind of paint without messing up the primer base coat?
_________________
1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
|
| Back to top |
|
|
raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
|
| Posted: Mon Nov 10, 2014 9:12 am Post subject: |
|
|
| Vanapplebomb wrote: |
I wonder if an epoxy primer would adhere well to it. I have seen several nice paint jobs on them, but never know what they did to get it that way.
Can you use one kind of primer, say an epoxy primer, and then paint over it with another kind of paint without messing up the primer base coat? |
The real key that we have not seen enough of is.....yes....we have seen quite a few nice paint jobs on shrouds.....but how many have lasted and for how long? I have mot seen much long term report back on whether the paint is starting to flake off which is the most common issue.
maybe ....if there is not, one already. ...you, could start a painted shroud thread so people could post what they have done and how long it lasted. Ray |
|
| Back to top |
|
|
Mike Fisher
Samba Member
Joined: January 30, 2006
Posts: 17970
Location: Eugene, OR
|
| Posted: Mon Nov 10, 2014 9:56 am Post subject: |
|
|
Aluminum/magnesium is ugly even when clean & only looks worse dirty! Painted it looks/cleans good. Primer would be good under the paint but it doesn't have to be epoxy. Use primer that best matches your paint.
_________________
https://imgur.com/user/FisherSquareback/posts
69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
two 57 oval ragtops sold
'68 Karmann Ghia sold
Society is like stew. If you don't keep it stirred up you end up with a lot of scum on the top! - Russ_Wolfe/Edward Abbey |
|
| Back to top |
|
|
jspbtown
Samba Member
Joined: January 27, 2004
Posts: 5156
|
| Posted: Mon Nov 10, 2014 1:26 pm Post subject: |
|
|
| I am not a pro but I would think that a good, two part epoxy, would be able to stand up to just about anything from a rattle can. |
|
| Back to top |
|
|
raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
|
| Posted: Mon Nov 10, 2014 3:10 pm Post subject: |
|
|
| Mike Fisher wrote: |
| Aluminum/magnesium is ugly even when clean & only looks worse dirty! Painted it looks/cleans good. Primer would be good under the paint but it doesn't have to be epoxy. Use primer that best matches your paint. |
Yes...agree....but the point is....with this manifold....is that about 90% fail to get ANYTHING to stick long term.
We can be sure its a combination of either cleaning/degreasing and/or proper paint mixture/type and/or poor application method/temperature/environment......but so many people who have used very good habits and methods with a wide range of paints and coatings.......that there is no clear reason (yet) for the failures of paint to stick to this part and material.
Its got a lot of heat expansion/flex and vibration......and its also very porous.
Let us know how long yours lasts.
I do look at it like this though.....if it lasts 3 years before it starts to crack and peel at all....and if it comes off easy.....thats fine with me. Its worth having my engine out about every other year anyway. Ray |
|
| Back to top |
|
|
Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5411
Location: Holland, MI
|
| Posted: Wed Nov 12, 2014 5:22 am Post subject: |
|
|
I just posted the question to the Bay Window Bus forum. Lots of painted blower housings in there. Guess I will see what kind of answers I get.
_________________
1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
|
| Back to top |
|
|
eyetzr 
Samba Member
Joined: October 09, 2013
Posts: 1425
Location: Toronto, Ontario. Canada
|
| Posted: Wed Nov 12, 2014 10:54 am Post subject: |
|
|
The issue with most of paint falling off & failure is bad prep. The problem with cast parts, mag. or al. is they are porous. These small cavities hold contaminates & then it gets warm & they try to escape & push the paint off. If you steam all the parts you want to paint & wiped them with wax & grease remover, you will see the oil trying to get out. I sand blasted my shroud & the next day wiped them for prime & they still had oil trying to get out. Ended up soaking the parts & hitting them with the compressed air.
_________________
I think he meant "rare", as in "not well-done" |
|
| Back to top |
|
|
|
