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Spray Painting

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  • Member since
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  • 172 posts
Spray Painting
Posted by kenben on Sunday, February 9, 2020 5:05 PM

I have a few structures to build that are plastic. I'd like to paint the pieces before assembly with same or simular colors as the original color but using flat colors. I don't think there is enough need to go with air-brushing since I don't have enough to justify that kind of purchase. (I'd don't know. Maybe?). 

What type of paint do it need and who has the best varity of colors to choose from?

Thanks.

  • Member since
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  • From: Bedford, MA, USA
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Posted by MisterBeasley on Sunday, February 9, 2020 5:13 PM

I go to the hardware store and get Rust-Oleum or Krylon for structures.  Several of the primers are good tones for brick.  I use several different rusty red or brown shades so the buildings don't all look the same.

Krylon makes clear flat spray if you want to simply get rid of the glossy plastic look.

Be more selective when painting rolling stock and motive power.  At least take a look at hobby shop spray painted first.

It takes an iron man to play with a toy iron horse. 

  • Member since
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  • From: Shenandoah Valley
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Posted by BigDaddy on Sunday, February 9, 2020 5:22 PM

I agree with Mr B.  Don't overlook the camo colors. I don't think you loose detail as long as you aren't heavy handed on the nozzle.

I've both hand and airbrush painted the .....don't know what they are called, DPM models have them, cement window sills and on top the windows.  Airbrushing looks better but it is masking intensive.

Henry

COB Potomac & Northern

Shenandoah Valley

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Posted by doctorwayne on Sunday, February 9, 2020 7:48 PM

kenben
...I'd like to paint the pieces before assembly with same or simular colors as the original color but using flat colors....

I've airbrushed structure parts while still on their sprues (it simplifies masking)...

...but can't see any benefit to pre-paint walls before assembly...paint on gluing surfaces is not conducive to a good adhesion, but assembling before painting allows you to correct joints which are not tight or have too much softened plastic which has oozed out of the joints. 

If you're painting only to kill the shine, rather than to individualise the structure to better-fit into your layout's purpose and era, you'd have better results assembling the structure first, then spraying it with a clear matte finish.  Easier assembly and a cost for only the clear coat.

Here's the structure for which those doors and windows were painted...

...and the stonework, after brush-painting...

...and then after the "mortar" was applied...

...and after it was completed...

For DPM structures with the one-piece walls, which include doors and windows as integral parts of the walls, I assemble the walls, then airbrush them a suitable colour.  The doors and windows are then brush painted, and the rest of the structure completed.  Here are some pictures...

This one was the same type of DPM structure, but with a little more painting for the trim, done with both brush and airbrush.  The kit was moulded in dark blue plastic...

This factory, 3' long and 1' deep, was made from two Walthers' American Hardware kits (with all walls used on the three visible sides, and .060" sheet styrene for the rear, unseen wall) was first airbrushed with the brick colour (Floquil Reefer Orange)...

...then all of the brickwork was masked, and the concrete portions airbrushed...

Once the masking was removed, I added mortar to the bricked areas, using pre-mixed drywall mud....

The pre-painted doors and windows (on their respective sprues, using an airbrush) were then installed, and the walls weathered...

Most of us use structure kits or pre-made structures, but if you don't go beyond just building them or plopping the ready-to-use ones on your layout, your layout will appear similar to that of others who use the same practices.
Painting, or detailing, or otherwise modifying such structures can lift them above the ordinary, perhaps not as well as something scratchbuilt, but it can make your everybody's-got-one type of kit stand out from the norm.

I'm not saying that anybody has to do this, but it's very satisfying work that's not all that difficult to do.

Wayne

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Posted by mlehman on Sunday, February 9, 2020 7:57 PM

kenben
I don't think there is enough need to go with air-brushing since I don't have enough to justify that kind of purchase. (I'd don't know. Maybe?).

Spary paint has come a long way. It used to be the only way to get a fine finish was to use an airbrush. But the paint and nozzles are better now. Krylon in particular is easy to use and control the flow of paint onto the model, but Rustoleum is pretty darn good except for taking longer to dry than Krylon and going on thicker if you're not careful.

I paint virtually everything with spray can nowadays, even though I have 3 airbrushes (that are only rarely used.) Once you factor in the cleaning needed to maintain an airbrtush, it's hard for me to do anything but grab the spray can first.

Mike Lehman

Urbana, IL

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Posted by G Paine on Sunday, February 9, 2020 10:58 PM

Rustoleum, Krylon (espacially Fusion), Testors, and the spray can version of any modelng paints are plastic friendly. Test anything else of scrap plastic to be sure the solvents do not attach anbd craze the plastic.

Many spray cans are designed to cover large surfaces, and put out a lot of paint. Do some practice on cardboard to get a feel of how it goes on, and try to reduce the flow rate

George In Midcoast Maine, 'bout halfway up the Rockland branch 

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Posted by doctorwayne on Monday, February 10, 2020 10:19 AM

While I've used spray cans, I find them awkward to handle, and seldom get decent results.

For me, airbrushing is both easier and gives better results.  It also allows me to paint with any colour I want - if it's not commercially available, I simply mix it myself. 
Besides that, I can also get more coverage out of a 1.75oz. bottle of Dullcote than from a 3oz. spray can of the same stuff....and, if I mix it with Glosscote, semi-gloss, in any version want.

Airbrush clean-up is not much longer than having to turn a spray can upside down to clear the nozzle (and waste a bunch of paint) - the spray can makers know their market.

Wayne

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  • From: East Central Florida
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Posted by Onewolf on Monday, February 10, 2020 10:41 AM

Since I don't (yet) airbrush I spray paint all my plastic structure kits.  Krylon and Rustoleum Camo have some nice flat colors.  Rustoleum 'Chalked' colors look really good however cans of Chalked cost significantly more than the Camo or plain Flat colors.

Modeling an HO gauge freelance version of the Union Pacific Oregon Short Line and the Utah Railway around 1957 in a world where Pirates from the Great Salt Lake founded Ogden, UT.

- Photo album of layout construction -

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Posted by wjstix on Monday, February 10, 2020 10:48 AM

I like to use Tamiya paint in spray cans. It should be available at your local hobby shop. Unlike some 'big box' store spray cans, Tamiya's spray cans are specifically designed for use on plastic models,   with a nozzle that produces a fairly fine spray - at least as good as say an inexpensive airbrush. Although their line of paints are primarily aimed at military modelers, there's enough of a range of colors that they will work well for model railroading too.

Stix
  • Member since
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  • From: Clinton, MO, US
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Posted by Medina1128 on Monday, February 10, 2020 12:18 PM

I used to turn spray cans upside down to clear the nozzle, but, this doesn't work with some of the paints, i.e. Rustoleum, Krylon. After using those paints, I remove the nozzle and spray CRC contact cleaner or brake cleaner into the nozzle. 

 

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Posted by kenben on Monday, February 10, 2020 12:44 PM

Question 2: Assuming I like the colors of the model right out of the box, all I need to do is spray with a flat clear coat of paint. What about weathering (pastel chalk)? Do I weather before I spray the flat coator after? Seems spraying after might mess up the chalk.

My basic process would be 1- wash all parts in warm soapy water and let air dry, 2- paint any parts where I want a different color, 3- build model, 4- spray clear flat coat of paint, 5- weather model. Good? Bad? A better process?

Thanks again.

BTW, great photos Doctorwayne.

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Posted by mbinsewi on Monday, February 10, 2020 1:40 PM

That sounds right.  The flat coat will give the weathering something to "bite" too.  If you seal it all with another coat, you might have to touch up some detail weathering, and give another light coat of flat, until your happy with the finish.

I don't do that, after I weather the building, I put it in place.  It's a building, how many times will you be handling it?  Probably none, after it's placed.

Freight cars that you handle on a regulat basis, yes.  Buildings, no.  That's just my way, do as you please.

Mike.

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Posted by jjdamnit on Wednesday, February 12, 2020 12:20 PM

Hello All,

One trick I learned for "rattle can" painting was to warm the can before painting.

I use a tall one-quart plastic container, put the can in the container and run hot tap water in the container.

Do not use boiling water!

My spray paints are stored on the enclosed back porch which is unheated. 

To get the cans warm I might have to refresh the warm water several times. Between refreshes I shake the can for about 30-seconds.

A side benefit of using this method is that when the can is immersed in the water it will float to the level of the contents of the can. This way you can check how much paint you have left and not run out mid painting. 

I still hold the can upside down for a few seconds to attempt to clear the nozzle. As has been posted, with modern cans this might not work but I believe it helps keep the nozzle clean.

Hope this helps.

"Uhh...I didn’t know it was 'impossible' I just made it work...sorry"

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Posted by wjstix on Wednesday, February 12, 2020 2:30 PM

kenben
Do I weather before I spray the flat coator after? Seems spraying after might mess up the chalk.

It will basically dissolve the chalk so you will see little to no effect of the chalk on the model. What I like to do is cover the model with a light overall coat of powdered charcoal (available at an art supply store) and then spray everything with flat finish. Unlike chalk, the powdered charcoal doesn't disolve. Then I use chalks or powders to add weathering here and there as I feel is needed.

This is a boxcar I did a while back. I brushed a patina of powdered charcoal over the roof, ends and sides, and then used a finger with a soft paper towel wrapped around to remove some of the charcoal on the smooth flat sides of the car. Dirt seems to accumulate more around seams and rivets on cars....

http://cs.trains.com/mrr/m/mrr-layouts/2289595.aspx

(Sorry if the link doesn't work, for some reason this PC and the MR forums don't like each other.)

 

Stix
  • Member since
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  • From: SE. WI.
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Posted by mbinsewi on Wednesday, February 12, 2020 3:03 PM

Stix's link:

http://cs.trains.com/mrr/m/mrr-layouts/2289595.aspx

You have to do the url hocus pocus to get it to work.

Mike.

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