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Paint Job(7 posts)

Paint JobJojo
Feb 19, 2002 5:25 PM
Anybody ever paint an aluminum frame? Should I wetsand to bare aluminum or just rough up the paint. Does it need primer. I'm using PPG.
re: Paint JobLone Gunman
Feb 19, 2002 7:08 PM
I think alot of places are using powder coat on alu but there is some chemical cleaning that needs done to the metal before paint with any paint for that matter, else it won't stick.
re: Paint Jobspdplayr
Feb 20, 2002 4:33 AM
i've painted several alu frames and i've used aircraft remover (stripper) from walmart. it costs like 8 bucks and melts the paint off with no damage to the frame. i then sand with fine grit and then rub it down with alcohol. i then use an epoxy primer or a regular metal one. i've done several jobs and been pleased with them every time.
be sure to prime as soon as you have the frame prepped as to avoid any exposure to the elements or our nasty atmosphere.
How good of a finished job do you want?Spoke Wrench
Feb 20, 2002 6:23 AM
Your finished product won't be any better than your surface preperation and the quality of the products you use.

Good luck.
re: Paint Jobracertex
Feb 20, 2002 7:46 AM
I painted part of my frame recently - flame job. It was scary, but yielded great results. I consulted a auto collision repair pro for the advice. I like the guys advice on using chemicals to clean the paint - I chose to sand it a little because I was doing such a small area... here's what i did:
1) clean the surface with acetone or like product.
2) outline the design you desire with tape. he suggested using an exacto knife to cut out curves, but i found it easier to use scissors on the tape first, then stick it on the bike. Take your time with this part because this is what your design will look like. You can buy the tape on the same aisle as the spray paint - it is like masking tape.
3) add more tape to cover the immediate area behind the taped off part and then cover all the other parts with newspaper. you don't want speckles covering your carbon forks.
4) scuff the area up with a scotch (brylo?)pad, careful around the tape.
5)wipe it off with a clean rag - don't touch it with fingers.
6) Use Krylon or rustoleum primer, keep the can a couple of inches further away than the instructions state and quickly dust the area with primer. a couple of quick blasts while changing angles and walking around the frame will do the trick. Do not try to cover the area with paint on the first try - many light coats are best. with the primer, your goal is to cover up the sanding scratch marks, not to cover the paint. It should take 3 light dustings. wait about 3 minutes between each dusting.
7) wait a half hour.
8)Use Krylon or Rustoleum acrylic enamel spray paint. Same deal as the primer except that your goal is to cover the area evenly with paint. It took me about 5 very light dustings. (3minutes apart)You can't be too careful. Always err on the side of too little paint sprayed.
9) wait 3 minutes then carefully remove the tape. If you wait too long to remove the tape, a border will emerge at the edges.
10) You're done. don't touch it for about a day - and don't try to scratch it for about 5 days.

good luck.
john
re: Paint JobMCCL
Feb 20, 2002 2:03 PM
Coulple things to add to the last great post. Primer is a filler so if you create a run which can happen on round surfaces easy. Wait till primer is hard (a day) sand with 280 grit and re-prime. You can put paint all the way up to a surface that has been sanded to a 500 grit but 400 grit is where paint shops go. So before you paint sand your primer with 400 grit. Wipe clean with a product called pre-cleano then wipe lightly with a cheese cloth. This is found at a paint and body supply store. Caution should be used when using rags. Where did mom wash and dry that rag. The softners that are used a lot in dryers like Downey and these little paper towles tosed into the dryers to help keep clothes soft contains sulfides etc. and can cause in the paint term fish eyes in the paint job. Pre cleano is also a great product to use before paint is applied to the primer/adhesion coat. 500 grit sandpaper is ok if you have to intervene on the pain somewhere. There is also a product called a adhesive promoter which is sprayed over the primer. It helps a bunch. It does come in colors and clear so it may help you get a base coat going. And maybe you want to put a clear coat on top of the paint. This must go on right away, before the paint has a chance to dry. If you are painting with a non metalic paint then you can wait till the paint hardens and wet sand the paint with a 400 grit paper lightly. Put on your decals and clean and apply the clear. I have painted many cars using this process and if you need finer details Post me a message. Good Luck MCCL
re: Paint JobMCCL
Feb 20, 2002 2:07 PM
Couple things to add to the last great post. Primer is a filler so if you create a run which can happen on round surfaces easy. Wait till primer is hard (a day) sand with 280 grit and re-prime. You can put paint all the way up to a surface that has been sanded to a 500 grit but 400 grit is where paint shops go. So before you paint sand your primer with 400 grit. Wipe clean with a product called pre-cleano then wipe lightly with a cheese cloth. This is found at a paint and body supply store. Caution should be used when using rags. Where did mom wash and dry that rag. The softners that are used a lot in dryers like Downey and these little paper towles tosed into the dryers to help keep clothes soft contains sulfides etc. and can cause in the paint term fish eyes in the paint job. Pre cleano is also a great product to use before paint is applied to the primer/adhesion coat. 500 grit sandpaper is ok if you have to intervene on the pain somewhere. There is also a product called a adhesive promoter which is sprayed over the primer. It helps a bunch. It does come in colors and clear so it may help you get a base coat going. And maybe you want to put a clear coat on top of the paint. This must go on right away, before the paint has a chance to dry. If you are painting with a non metalic paint then you can wait till the paint hardens and wet sand the paint with a 400 grit paper lightly. Put on your decals and clean and apply the clear. I have painted many cars using this process and if you need finer details Post me a message. Good Luck MCCL