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bike paint job

Old 11-01-07, 10:00 PM
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inexa
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bike paint job

hi,

i am wanting to put a shiny glossy look to my road bike frame. i am happy with the current paint job, but just want to add a clear coat or smthin to make it shiny. any products or tips on what to do?

chrs,
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Old 11-01-07, 10:27 PM
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Any decals on the frame currently?

The usual procedure is to wet-sand the paint layer with very fine paper to smooth out the paint and allow the clearcoat to adhere.

Obviously you can't do that if you have decals you want.
Strip the bike, wash it down well, follow with alcohol wipe down. Use a paint polish to buff up the old paint. Wash well again and alcohol wipe and tack cloth it dry.
I've used automotive high gloss clear with good results. Apply several thin coats, not one thick one.
Use a lot of bright lighting to assure you are getting the frame fully coated and evenly.
Let it dry for 24-48 hours, longer the better.
Follow up with a polish for any rough/dull spots.
Don't wax for 2 weeks.

I recommend 3M pre/post paint prep products.
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Old 11-01-07, 10:46 PM
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Personally I don'rt recommend ever spraying clear over existing paint. Decals or not. For two reasons. 1) road grime and dirt build in areas like under the b.b shell, seat and chain stay bridges and grease from bearings in b.b and head set. You cant always get it all off and it will trash a clear coat of any caliber. Automotive or spray can. 2) You dont know what typeof paint the factory used. Some times you can have an adhesion problem with the clear and the base coat (color). You want a cross link. This is when a clear coat can actually reactivate the color and they bond to each other. Rather than the clear just sitting on the color. Or another problem is the new clear blisters or has a negative reaction to the old paint.
In my opinion, the right way to do it is Paint strip the old paint down to metal with a aircraft paint remover, sandblast or media blast the frame clean and prime with an etching primer. Also it is best th use products from the same mfg. I recommend DuPont. Etching primer, color and clear.
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Old 11-01-07, 10:49 PM
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inexa
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my frame is new, so there is no dirt on it watsoever
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Old 11-02-07, 04:28 PM
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For clearcoat to bond, it has to be sprayed within a certain time after the paint. Even if the frame is new, that time would have passed and the clear will eventually peel. Clearcoat only became popular after auto manufacturers were forced to use low gloss water-based paint. There are lots of automotive wax/polish products that will make your frame shine better than clearcoat.
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Old 11-02-07, 04:45 PM
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Which cars are painted with water based paint?
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Old 11-02-07, 04:55 PM
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Originally Posted by Dirtdrop View Post
Which cars are painted with water based paint?
All of them now, I believe. At least those made in car plants. Body shops may not be as strictly regulated. It started years ago in California.
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Old 11-02-07, 08:05 PM
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I've never heard of this. Does it make sense to use a water based color coat to protect the environment and then spray on a highly toxic clearcoat? I'm incredulous. What is your source for this information?
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Old 11-02-07, 08:24 PM
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Originally Posted by Dirtdrop View Post
Does it make sense to use a water based color coat to protect the environment and then spray on a highly toxic clearcoat?
It seems that even the clearcoat can be water based, it says here, which I didn't know. The basecoat/clearcoat system has been used since the 1980s, but not always successfully.
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Old 11-02-07, 08:50 PM
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Even after reading that page, I still don't believe that they're using water-based paint.

I can't find anything online to confirm or deny it, but this seems to indicate that they were not using water based paint in the '80s:

http://www.ct.gov/dep/cwp/view.asp?a...epNav_GID=1763

The only water-based auto paint I'm familiar with is AutoAir and it is normally finished with a urethane clearcoat.

http://www.autoaircolors.com/

Last edited by Grand Bois; 11-02-07 at 09:08 PM.
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Old 11-02-07, 09:37 PM
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Originally Posted by Dirtdrop View Post
Even after reading that page, I still don't believe that they're using water-based paint.

I can't find anything online to confirm or deny it, but this seems to indicate that they were not using water based paint in the '80s:

http://www.ct.gov/dep/cwp/view.asp?a...epNav_GID=1763

The only water-based auto paint I'm familiar with is AutoAir and it is normally finished with a urethane clearcoat.

http://www.autoaircolors.com/
It's true. Sikkens/ AKZO-Nobel and BASF are major developers of waterborne OEM coatings for the automotive industry. Most of the majors are using water-based paints. Previously heavily-used urethane mineral solvent-based coatings like Dupont Imron are regarded as quaint relics of the past, although some truck manufacturers still use them.
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Old 11-03-07, 09:59 AM
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What will they think of next?

I want to know where I can buy some water based clearcoat.
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Old 11-03-07, 11:44 AM
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Originally Posted by inexa View Post

i am wanting to put a shiny glossy look to my road bike frame. i am happy with the current paint job, but just want to add a clear coat or smthin to make it shiny. any products or tips on what to do?
You can try 3m paint protection film:
http://www.xpel.com/

But applying it is a very tedious process because you have to create templates for your frame tubes.
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Old 11-03-07, 12:43 PM
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Originally Posted by Barabaika View Post
You can try 3m paint protection film:
http://www.xpel.com/

But applying it is a very tedious process because you have to create templates for your frame tubes.
That is a clear flexible film applied to the hood and front end of cars to avoid stone chips. I've seen it and it looks good and you can almost not see it unless you look for the edges. Quite expensive too, since the sheets have to be custom fitted. Can't see where it would be any use on bike frames. Just use a good car wax. I use Zaino on my Camaro.
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Old 11-03-07, 05:30 PM
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It's not extremely expensive because you can buy it in bulk. Bike tubes are thin, you don't need much.
http://www.xpel.com/products/bulk.asp

You cut stripes, cut holes in them, and wrap your bike tubes in this film, that's how you use it. Though, it will work better with the tubes that have sharp edges like in lugged frames.

Wax is useless when you want to protect your bike paint from stones, etc.
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Old 11-03-07, 05:40 PM
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Originally Posted by Barabaika View Post
You cut stripes, cut holes in them, and wrap your bike tubes in this film, that's how you use it. Though, it will work better with the tubes that have sharp edges like in lugged frames.
Sounds like a plan for the down tube and seat tube. I guess the lugs would have to be really plain, or a TIG welded frame. Wouldn't want to do it on a nice vintage bike with fancy lugs.
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Old 11-03-07, 06:39 PM
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8mil film stretches a lot, so you can use it even for forks.
It's more cost-effective to buy a wider film and cut strips yourself than to buy a narrower strip.
30" x 2ft = $34 That's not much.

But, as I told before, it's a tedious job if you want the edges to fit perfectly. Also, repair stand clamps can leave marks on the film.

Last edited by Barabaika; 11-03-07 at 07:08 PM.
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Old 11-04-07, 09:58 PM
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so there is no special glossy paint for bikes that'd work?
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Old 11-05-07, 10:53 PM
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Base Coat/ Clear coat is the way to go if you want long lasting shine. If done correctly, you don't need to wet sand, polish, wax or any of that. Du Pont makes a b.c/c.c system called "Chroma-base" and Chroma-Premier.
If you can get it...use it. Not water based though. But this is the best. I have sprayed this stuff lots of times. Hundreds of bikes a year for about 6= years. DuPont actually gives you a warranty if you use this paint and it is sprayed by a trained and qualified painter. I went to the DuPont training center (twice) and was certified to spray it. No...I do not work for DuPont but after spraying PPG, BASF, DuPont and having lots of frames powder coated (CRAP!) I would never go back to anything but DuPont Chroma-Premier. I used 72400s Clear over my b.c/c.c system. From the time I finished my color coat, cleaned my gun, mixed my clear the frame was ready for the clear to be applied. 3 coats. 1) fine mist "Tack" 2) mid coat and 3) a flow coat. It went on wet and when it was dry, it looked wet still. This is the stuff. I also sprayed some water base primer from BASF and DuPont. This was back it the early/mid 90's. This was junk and had an adhesion problem nomatter what color/ clear was applied on top.

S.C
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Old 11-06-07, 12:50 AM
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Going back to the original question, how to make the frame look shiny. I would start out with a bottle of Pedros Bike Lust. Then if that isn't enough get some of that turtle wax ultra fine waxing gloss. I have used this technique to sell bikes that don't sell in the shop. The result, they sell within a week after the treatment!
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Old 11-06-07, 12:17 PM
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Originally Posted by inexa View Post
my frame is new, so there is no dirt on it watsoever
If the frame is new, then I would assume that the decals already have a clearcoat over them?

In that case, just scuff the frame with a fine Scotchbrite pad. Clean thoroughly with PPG's DX 330 Wax & Grease Remover. Spray 2-3 coats of clear. I like the finished results of PPG's 2042 clear.

If the decals are NOT cleared over, then cover them with Delicate Surface blue painters tape and scuff carefully around them. Clean with DX330. Remove the cover tape and clear as above.
 
Old 11-06-07, 12:29 PM
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Originally Posted by Dr.Deltron View Post
If the frame is new, then I would assume that the decals already have a clearcoat over them?
You call yourself "Painter Extraordinair", so I presume you know more about it than most of us. Do factory bike paint jobs actually have clearcoat over the decals, or just the really high-end ones? I know that custom framebuilders and painters do it that way now, but when did it start in the regular bike industry?
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Old 11-06-07, 12:42 PM
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Originally Posted by OLDYELLR View Post
Do factory bike paint jobs actually have clearcoat over the decals, or just the really high-end ones? I know that custom framebuilders and painters do it that way now, but when did it start in the regular bike industry?
Many "factory" paintjobs clear over decals, but as you mentioned, it's more likely on the higher end models.
Bikes like Magna's use a sticker OVER the final paint coat. But they can be cleared over, if that's what you're doing.
Usually a close visual inspection will let you know if the "decals" have been cleared over. Stickers will have an edge that your fingernail will "catch" on. If they are cleared over, it will be a bump, not an edge.
 

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