Why removing chrome from chromed parts ?

mfsob

I will give Windex a try. Messing around with water and ammonia sounds like a good way for a guy with my luck to get a chemical burn ... try explaining THAT in the emergency room. 

Windex is water and ammonia, pretty much.  And some coloring agent and other odds and ends.  Basically a weak ammonia solution.

Windex helped in some spots, but left this odd brownish goop in all the recessed areas like grille work, which I then had to use oven cleaner to try and remove ...

At this point, rather than further risk melting these parts, I'm going to lightly sand the remaining chrome spots and break out the spray cans and paint bottles.

I don't know how to reply to every one of these posts, so I'll reply to this one.  They are all freaking brilliant.  You have answered, in detail, my whole issue.  I'm completely new to chrome.  Experimenting with bare metal, that tube of True Metal, and alclad II.  The whole worry has been: 'wait a minute, I just want to rechrome the sections of the fender where I sanded the sprue bits off'.  One cannot do that. And now I hear from you that I should completely dechrome the kit parts and have it be uniform.  Absolutely brilliant.  Not a time saving event, but none of us are in it to hurry.  

Thank is all I'm saying.  I'm going to reread all your comments.  The light bulb went on!

I use SuperClean, and it dissolves the chrome in about 2 minutes.  But its active ingredient is lye, like most oven cleaners, so I don't know how it would have worked with that kit.

I will give Windex a try. Messing around with water and ammonia sounds like a good way for a guy with my luck to get a chemical burn ... try explaining THAT in the emergency room.

Ammonia does the trick, guys.  You can use Windex, or mix a stronger solution of water and ammonia.  It takes awhile, you will have to submerge it overnight or maybe two.  Be patient and let it soak, the chrome plating will eventually disappear.

The only other method I've heard of, that you haven't tried; is brake fluid.

I tried that but didn't think it worked too well, and disposing of the brake fluid was a problem.

Well, I fought the chrome, and the chrome won. Bleach ... oven cleaner ... Simple Green ... all of them kinda' sorta' removed some of it, but it seems that larger flat areas are impervious.

It's a newer AMT kit, and trying to deal with chrome is a new experience for me since I'm basically a ship guy. Plan D is to lightly buff all the chrome with 600 grit sandpaper, hit it with Tamiya spray can primer, and hope for the best with my brush-painted metallics.

The Jeep CJ-7 I've just built had really heavy, very bright chrome and most of the research photo's I gathered (as I do with every build) showed that 99% of the factory built cars were white, so I stripped the chrome and sprayed them white.

As mentioned by a previous message where the wheels were to be cut from the sprue there was a big lump of white plastic so shaving that sprue lump off showed a large area of white plastic where it would show even after the tyres were mounted.

BigJim

I learned a long time ago to just soak the part in Clorox. Never had a problem.

 

If you check what Clorox is actually made from, then the main ingredient that removes the shiny stuff is  Sodium hydroxide.

Why not just use it straight, instead of buying all this other junk.

https://en.wikipedia.org/wiki/Sodium_hydroxide

I learned a long time ago to just soak the part in Clorox. Never had a problem.

mfsob

Well, the spray on oven cleaner didn't work. Guess I will have to track down this Simple Green stuff mentioned above.

Tell you what, this AMT chrome is tough.

 

I tried several tricks to get AMT chrome off a tanker trailer frame.  Gave up after 2 weeks of messing with it.  Moved on to something else.  Good luck.

T e d

Well, the spray on oven cleaner didn't work. Guess I will have to track down this Simple Green stuff mentioned above.

Tell you what, this AMT chrome is tough.

It might come to foil, or Bare Metal Foil, which I have ... somewhere. When my wife saw me rummaging under the kitchen sink for the oven cleaner, she asked what I was going to do with it and then politely suggested I not blow the house up while I was doing it.

Hi;

 I was going to reply to the fellow that suggested Not using Foil. Now that said. Since I found out Chrome Tech is no longer in business I use my trusty Molotow unit and still use foil too.

   I have never had problems with foil on curved surfaces. Why? Well you cut relief slots in the foil. Burnish well. Then,take a brand new Single edge razorblade ( NOT a new number11 X-Acto blade! ) and cut off the overage. Burnish well with the side of a Aluminum X-Acto number one handle or a piece of aluminum tubing.

    Using the tubing or handle seems to make seams dissapear and the chrome in that area seems shinier too! I have tried Alclad and I don't care for it. More work than foiling on just a bumper.

If seams need removing on chrome you can use either BMF or Molotow pen to replace the lost chrome.

True, I generally choose to live with the mold parting seams.

The casting process in any plastic kit is going to leave casting marks in some form. Usually this is a thin line of plastic along parts you have to sand or remove with a knife. It leaves you in an awakward position where you have to remove the chroming to clean the part of have the chroming but obvious seam lines along parts. It's a lose/lose situation.

I remove it for the reasons Pat mentioned, however I leave it where it would be on the real thing. This model had chrome cylinder heads, crank case and trans cases. (wrong). I stripped those and painted them with Alclad II to look like aluminum. The pipes on the other hand look right left plated.

All model "chrome" plating is not equal. Some comes right off, others are a bear to get loose. I've tried about everything except purple powder, which is said to work well.

Try spray oven cleaner. Most of those kinds of things are lye based and are quite caustic so wear gloves.

the doog

The very first thing I do when building a new car kit is BOOM!--sink the chrome parts in bleach, and usually within 1/2 hour I have nice bare plastic. Quick, easy, and then oh-so-much easier to work with.

I'm tackling a car kit for the first time since, oh, dinosaurs roamed the earth, and decided the chromed parts were too ... chromy/shiny/whatever.

I've tried soaking the parts in bleach, going on two hours now, and some of the chrome - mainly on the large flat areas, is staying stubbornly attached. On fine details like grills and vents, it came right off. Suggestions?

For me I remove it because like many have mentioned the part shouldn't be chrome at all.  For instance the Hemi cuda kits come with chrome valve covers.  Many don't realize it but they never came that way.  They were painted black from the factory.  Other kits will have other parts that have no business being chrome unless you are making an insane show rod.  Typically axles, starters, hoses, intakes, etc are not chrome.  Thats what drives me nuts about AMT's Semi Trucks.  When have you seen a Semi with chrome drive shafts!??!?

The most important reason for application is it lessens the chance of flaking when you paint it the correct color.  Paint doesn't tend to bond very strong to the chrome surface even if you use primer, and will flake and wear on the edgeds.  Removing the chrome and "roughing" it up a bit with very fine steel wool creates the perfect surface for paint to adhere to.

In some kits the engines come fully chromed which doesn't happen in real life, so I get out the oven cleaner fluid and after an hour or so it's all gone. I can then paint the engine in more traditional/real colours.

Jay, while you can brush paint it, and I've successfully done that on small parts/sections (namely a polished rim effect on a set of wheels for a car I'm building), it's best sprayed.  Like spraying, it requires several coats to build up to the desired effect.  With brush painting, though, you have to wait until the previous coat is completely dry before you apply another coat.

And just like the pieces you air brush, you have to first coat the part with a gloss coat of usually black paint.  If you brush that on, your brush marks will show up under the alclad.  

Gene Beaird,

Pearland, Texas

Alclad 2 has about 19 shades of metal.  No way can you get that realistic appearance from kit plating.

BMF has it's place with large flat surfaces.  Very small parts with indented surfaces are plated better with Alclad 2.

http://alclad2.com/

I saw some people putting the chromed sprues in Simple Green and let them soak for a few days before removing the excess paint with a stiff toothbrush.

Talking about Alclad (I never used it), can you hand brush it or you must use an airbrush to put a coat on the parts ?

Also, does it come in many "colors" (don't know how to properly call this) as does it come in dark chrome, light chrome, heavy chrome, etc. ?

The very first thing I do when building a new car kit is BOOM!--sink the chrome parts in bleach, and usually within 1/2 hour I have nice bare plastic. Quick, easy, and then oh-so-much easier to work with. Not only can you easily glue pieces without the mess, hassle, and waiting time of epoxy--yuck!--but you can sand the attachment points and clean up burrs, parting lines, etc--real necessities if you're serious about producing a high-quality build. A simple coat of Alclad imparts an amazingly bright sheen of chrome for pennies when you can do a dozen kits or more for the price of one $7.00 bottle.

The previous poster talked about using bare metal foil or sending pieces off through the mail to some re-plating company. Whatever floats your boat, but speaking for myself, I would go mental if I had to wait for parts to get back from some company when you want to get building. And having worked with bare metal foil plenty of times, I can say that this is an impractical choice for curved bumpers and pieces like manifolds and valve covers. Not to mention that BMF can have a very high "learning curve", and it also can have adhesion problems if its old. You're much better off getting some Alclad. You won't believe how easy it is to use and how high quality it looks.

Hi,JayF;

    I have to ask you. Is the kit you're building New? The reason I ask is this . Many older straight MONOGRAM kits had a tendency to have Chrome plating disappear over time. I don't know if it was oxidation or what . My 70 Malibu looked kind of funny with yellow plastic showing through the chrome.

   Unlike many, I do Not use Alclad in any build  . I use foil Chrome exclusively . Or if it's for a contest build then I send them to Chrome -Tech, inc. For that professional touch . This requires stripping all the original plating off . For a few bucks more they will do set-up and stripping for you .

     In case you ask. I use the cheapest , shiniest foil I can find and then make my own . Yes, I do use " Bare-Metal " foiling too . It just depends how many colors of aluminum I want to represent on a natural metal airplane .

     As far as scale thickness I really didn't know anyone was OCD enough to measure the plating thickness. I never have . After all,why is that necessary if the kit chrome is good ? As far as autos are concerned ,They could put the sprue connections in a spot harder to see . Many times it's a line vertically cutting the bumper, say from the ends. If you trim the line off , well you've got a bare plastic spot.

    The right shade of foil chrome , Burnished thoroughly will hide that and you can't see the edge of the foil chrome anyway, Unless you use a magnifier . Only OCD judges do that .         T.B.

JayF

Do you think I can glue using 2-parts epoxy ?

Do you mean the chrome parts or the whole kit?  Epoxy will work, but I don't see the advantage for most of the kits. For the chrome parts, you need to remove the chrome from the gluing surface (usually the bond of the plating is not really strong enough to rely on), so you can glue the part with anything that will stick to styrene.  If you glue the part with epoxy, without removing plating, the glue WILL stick to plating, but the plating bond is very much at risk of failing if it is a big part. If it is a small part, you can get away with it without removing plating, but in that case CA will work also, and is easier (and smells better) than epoxy.

Thanks all for your answers !

Right now I'm building the Monogram 1970 Road Runner and I was looking for some color ideas for the body.

On one of the site I went to check it was such a big deal to REMOVE the chrome for those parts, but nobody ever venture as to explain why.

Do you think I can glue using 2-parts epoxy ?