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Painting underhood componenets
#1
What are the steps to painting some underhood components... like the air-intake tube and just some other plastic composite pieces.

THANKS!!! Big Grin
2004 Pontiac GTO M6 Barbados Blue/Black Leather (one of 271)

Skip-shift eliminator, 160 T-stat, K&N FIPK, Resonator delete, 255/45 out back, 245/45 up front, 5% tint, 28mpg hwy!

[Image: 7252301066_b19f58654b_z.jpg]

2008 Dodge Charger SE Plus 3.5LSOLD

2007 Toyota Yaris SSOLD

1997 Lincoln Mark VIII<Sold

1970 Olds Cutlass S 350/350 B&M reverse valve body (Sold)

1969 Pontiac Firebird 350/400 NOS (Sold)
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#2
For both metal and plastic, start by degreasing THOROUGHLY. You need to overkill on this step because there are going to be plenty of oils and likely silicones on most of those parts(silicones from rubber protectants at some point or other, by someone) and you WILL get plenty of fisheyes if you don't get everything squeaky clean and contaminant free.

3M makes a product called Prepsol, and there are many others that do the job just as well. You can use Dawn dish detergent and water to start, rinse WELL, dry, then the Prepsol or equivalent. Make sure the rag you use to apply the degreaser is new or very clean.

Next, you will need to lightly scuff the metal parts with 600-800 grit (wetsandpaper is good) to allow a good bond. Degrease again after this step to remove any sanding residue.

If the metal is unpainted, a primer is needed. Or...buy a "self etching" primer which doesn't require prior sanding. Mar-Hyde makes a very good one;

http://www.bondo-online.com/catalog_item...temNbr=587

...as does Dupont and SEM ( http://www.handsontools.com/store/show_p...ct_id=9109 ) They should be lightly scuffed then painted over.

For plastic parts, you should look into Krylon's Fusion;

http://search.hardwarestore.com/exec/?qu...pray+Paint


It's also self-priming and chemically bonds to plastic permanently. You do not need to sand prior to spraying Fusion to plastic parts, just degrease.

When you spray either metal or plastic, start with light, thin coats, a medium coat, and then a a final wet coat.
Best of luck! Smile
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#3
cool deal, i will use that Fusion spray paint.
one more Q: after the paint dries, can i use clear coat on it to give it a little deeper shine?
2004 Pontiac GTO M6 Barbados Blue/Black Leather (one of 271)

Skip-shift eliminator, 160 T-stat, K&N FIPK, Resonator delete, 255/45 out back, 245/45 up front, 5% tint, 28mpg hwy!

[Image: 7252301066_b19f58654b_z.jpg]

2008 Dodge Charger SE Plus 3.5LSOLD

2007 Toyota Yaris SSOLD

1997 Lincoln Mark VIII<Sold

1970 Olds Cutlass S 350/350 B&M reverse valve body (Sold)

1969 Pontiac Firebird 350/400 NOS (Sold)
Reply
#4
Yes, generally you can, but...

I would suggest that you just use a base / clear shaker pack for the metal parts to begin with. Dupli-Color sells them that way, as do other companies that make rattle cans. Some paints aren't going to be chemically compatible with others, and funny things (wrinkling. lifting, alligatoring etc.) *could* occur, especially if you use one brand of spray color and another brand of shaker can clear. Also, make CERTAIN you don't use a clear lacquer over an enamel base. You will have problems. As a rule, enamel over enamel is ok, lacquer over lacquer is ok, even enamel over lacquer is ok generally, just not lacquer over enamel.

Now..on the plastic parts that you're using Krylon Fusion on...I do not know if that paint will support a clear topcoat. One way to find out is either email them, or test the process on another item (a plastic garbage pail or similar etc.) rather than risk your newly painted underhood part.
[Image: xstorquesig.jpg]
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#5
Who's this Dan guy? He dosen't know anything! Tongue Hey Dan, hit me up sometime in the near future, I've got something to discuss with ya! :x
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#6
Quote:Yes, generally you can, but...

I would suggest that you just use a base / clear shaker pack for the metal parts to begin with. Dupli-Color sells them that way, as do other companies that make rattle cans. Some paints aren't going to be chemically compatible with others, and funny things (wrinkling. lifting, alligatoring etc.) *could* occur, especially if you use one brand of spray color and another brand of shaker can clear. Also, make CERTAIN you don't use a clear lacquer over an enamel base. You will have problems. As a rule, enamel over enamel is ok, lacquer over lacquer is ok, even enamel over lacquer is ok generally, just not lacquer over enamel.

Now..on the plastic parts that you're using Krylon Fusion on...I do not know if that paint will support a clear topcoat. One way to find out is either email them, or test the process on another item (a plastic garbage pail or similar etc.) rather than risk your newly painted underhood part.

sweet info! i will probably just stick with the base coat just to avoid any of the mentioned problems.
i will post some pics when i am done with it all! Big Grin
2004 Pontiac GTO M6 Barbados Blue/Black Leather (one of 271)

Skip-shift eliminator, 160 T-stat, K&N FIPK, Resonator delete, 255/45 out back, 245/45 up front, 5% tint, 28mpg hwy!

[Image: 7252301066_b19f58654b_z.jpg]

2008 Dodge Charger SE Plus 3.5LSOLD

2007 Toyota Yaris SSOLD

1997 Lincoln Mark VIII<Sold

1970 Olds Cutlass S 350/350 B&M reverse valve body (Sold)

1969 Pontiac Firebird 350/400 NOS (Sold)
Reply


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