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How to prevent decals from appearing too shiny?

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  • Member since
    August 2003
  • From: Collinwood, Ohio, USA
  • 16,235 posts
Posted by gmpullman on Friday, May 14, 2021 12:11 AM

wp8thsub
Airbrushing can yield a smoother and more evenly matte application than you can get from a spray can.

I agree. 

I'll use the rattle can 1260 Dullcote for quick touch-up jobs but for a true dead-flat finish mixing my own bottled 1160 Dullcote, sometimes blending it with varying amounts of gloss, provides an excellent finish when airbrushed on.

I tried that "Dead-Flat" Rustoleum 302151 which was hyped on another forum as being better than Dullcote, or at least an equivalent. It was anything but. I might use it on track or scenery but it is worthless on any structure or rolling stock.

Good Luck, Ed

  • Member since
    November 2002
  • From: US
  • 2,455 posts
Posted by wp8thsub on Thursday, May 13, 2021 9:07 PM

20201109_215455

by wp8thsub, on Flickr

Airbrushed flat finish like Dullcote for the win.  The car above was painted with glossy acrylic from TruColor to aid in decaling, then finished with Dullcote after weathering was complete.  Airbrushing can yield a smoother and more evenly matte application than you can get from a spray can.

Rob Spangler

  • Member since
    January 2004
  • From: Canada, eh?
  • 13,375 posts
Posted by doctorwayne on Thursday, May 13, 2021 11:57 AM

The only time decals, once applied, should be shiny is if the object being decaled is meant to represent a recently painted and lettered model of a recently painted and lettered prototype.

I don't wish to bore you, but here's my procedure for doing decal work on locomotives and rolling stock.   Feel free to cherry-pick the parts which apply directly to your dilemma, and skip the parts which either don't apply or aren't of interest to your needs....

First, I would suggest that you wash the car (or locomotive, structure, etc.), using warm water and dish detergent, then rinse it thoroughly with water and let it air-dry.

Once it’s dry, airbrush it in an appropriate colour(s), then set it aside to let the paint dry/cure/harden, depending on the type of paint you use.

Once that is done, airbrush the entire areas which will be decalled with Glosscote (or your preferred clear gloss) then let it fully dry until there’s no odour of solvent present on the car.  
Don’t apply the gloss only where the decals will be applied - for rolling stock and locomotives, those areas are usually the sides and ends - cover them completely with the gloss, even if the amount of decal work will be very minimal.  
Allow the clear coat to fully cure/harden - there should be no noticeable odour to it, (this minimises the chance of the setting solutions reacting with the clear coat).

Next, use a sharp blade to cut the needed decals from the sheet, keeping as far away from the lettering as possible.  Once you have all of the required lettering free of the main sheet, use a sharp blade (re-sharpen or replace as necessary) and working on a hard surface (I use a sheet of glass on my work desk for this), to trim away as much of the blank paper from as close as you can maneuver the blade to the lettering, using a straight down chopping motion, rather than slicing it away.  If necessary, do this work under magnification (eyeglasses, Optivisor, or loupe).

The reason for the two-part cutting is that slicing the image, even with a sharp blade, raises the edges along the cut line, and when you apply that decal to the model, the setting solution is often insufficient to make those edges settle completely flat onto the surface.

Using a chopping motion has a couple of advantages, first that it allows you to position the tip of the blade as close as possible to the lettering, and second, that when you bring the blade down to make the cut, the chopping movement pushes the edge of the decal downward, which will allow better and easier setting of the lettering when it is time to apply that solution.



Another tip to decrease the chances that your lettering job will look obvious as decals, is to trim the excess clear film from rounded letters or numerals such as B, C, O, P, 2, 3, 8, 0, etc. which are at the beginning or end of a block of lettering.  
F’rinstance, on a CANADIAN NATIONAL car, I would use a simple diagonal chop to remove the clear film from the top and bottom left side of the “C”, and the clear film from the “L” at the end of NATIONAL - this latter chop could be a simple diagonal from the top to the right edge of the foot, but an L-shaped cut would give even better results.

The same trimming can be applied to dimensional data, too, even if you apply it in the blocks in which it’s printed.  For example....

CAPY        100000
LD LMT     120000
LT WT         49000

....trim the top left corner of the “C”, the top right corner of the last “0” in the top line, and the bottom right corner of the last “0” in the bottom line with a simple diagonal chop.
You will be surprised by how much difference it can make in the finished appearance.


Use distilled water for soaking the decal - it's available in gallon jugs at any supermarket, and not at all expensive.  This eliminates any dissolved minerals which might otherwise be present in tap water, and a gallon will do a lot of decals. 
Do not rush the soaking process for the decal, but allow it to release from the backing paper on its own.  If it's big enough to handle with tweezers (not something small, such as a single digit for dimensional data), dip the released film into water, submerging it completely, then, as you withdraw it from the water, drag the back-side of it over the lip of the container holding the water - this helps to remove any residue left from the backing paper.  Depending on the particular decal, you may want to repeat this a couple of times.  
Smaller decals, like blocks of dimensional data or single numerals, can be simply dipped into the water, then set on your work surface while the water frees them from the backing paper.

Most decals applied using only water can be re-wet and moved an almost infinite number of times.  For very small pieces of decal (a single letter or numeral, or even a period or comma, I place the dry decal near its intended place, then wet it with a drop of water on my fingertip or the end of a knife or tweezers.  It can usually be slid off the backing paper easily, then maneuvered into place.



Use references on the model (rivet lines, panel lines, doors, ladders, and other details) as guides to position the lettering correctly and level.  Where those details aren't available, I like to cut strips of masking tape as guidelines, and when lettering with individual letters or numerals, often use a pencil to denote, on the tape, the beginning and end of each word, so that the spacing is correct.
  
Likewise, individual letter spacing is not usually uniform, but rather depends on the particular letters and their sequence within the words.  Google "kerning" for more info.



Once the decals have been applied on the gloss surface and have been blotted using a clean cloth, I use a small brush to apply a fairly weak setting solution around the perimeter of each individual pieces of decal, and also on the decals’s surface - Microscale’s Microset works well for this step.  Let the decals dry fully - it usually takes 10 or 15 minutes at most.


Next, I use the brush-in-cap from the Solvaset bottle to apply this stronger decal setting solution, in the same manner as the previous operation.  I let this dry completely (a couple hours at least, although I often leave them overnight) then use a clean cloth over my fingertip, dipped in the distilled water to wet it, then gently rub the wet cloth over each piece of the applied and set decals - this should remove any marks left by the action of the Solvaset.  Use a dry portion of the same cloth to remove any remaining water from the model’s surface.
After the decals have been cleaned and have fully-dried,  I overspray them with another coat of clear gloss.  This step may seem unnecessary, but the gloss of the decal seldom matches exactly the gloss of the surface on which it has been applied.  This overspray ensures that the entire surface has a uniform finish.

If you're using an airbrush for applying the clear finish, it will dry (to-the-touch, at least) very rapidly, and you can then apply the flat (or semi-gloss, if you're modelling a fairly new car) almost immediately.  After this step, the decal work is completed, and the car set aside, usually at least overnight or for a day-or-so to let the clear coats fully harden.



  
Airbrushing gives you the option of mixing that final clear coat to whatever sheen or flatness you wish for that particular model.

The car can then be weathered as you wish, but unless you're weathering using oils or chalk, I'd recommend no flat overspray over the weathering, as it usually makes the weathering effects too uniform.

Wayne

  • Member since
    September 2003
  • 21,355 posts
Posted by Overmod on Thursday, May 13, 2021 11:34 AM

BigDaddy
If you applied them on less than a glossy finish, you may be seeing silvering.  I've had no luck getting rid of that, because it is underneath the decal. 

You apply a small amount of something like Solvaset to the face of the 'silvered' portion and use an extremely sharp thin point to pierce the decal film.  This allows solvent to wick in and displace the trapped air, and ideally reactivate the adhesive -- the softened film will then snuggle down as the solvent evaporates.

This is the same technique used to remove air bubbles before a new decal sets.

A better 'cure' is to apply decals only to a shiny and well-sealed surface, and do all the 'dulling' and weathering on top.  It can be very hard to force decals to conform to some dull or irregular surfaces without extensive pricking or cutting, which can easily damage or deform them.

  • Member since
    December 2015
  • From: Shenandoah Valley
  • 9,094 posts
Posted by BigDaddy on Thursday, May 13, 2021 11:27 AM

If you applied them on less than a glossy finish, you may be seeing silvering.  I've had no luck getting rid of that, because it is underneath the decal.

Henry

COB Potomac & Northern

Shenandoah Valley

  • Member since
    February 2002
  • From: Mpls/St.Paul
  • 13,776 posts
Posted by wjstix on Thursday, May 13, 2021 10:29 AM

It's a good idea to use a product like Solvaset or Micro-sol to 'snuggle down' the decals before sealing them in. Flat spray from a spray can works great, you can use Testor's lacquer based spray, but I generally use Tamiya 'flat clear' spraycan spray. (You also want to spray gloss finish on the car or structure before you decal it too; decals work better on gloss finish.)

Stix
  • Member since
    March 2021
  • From: Quebec, Canada
  • 129 posts
How to prevent decals from appearing too shiny?
Posted by ModelTrain on Thursday, May 13, 2021 6:13 AM

Hi everyone!

I am using decals on one of my model but I don't like the shiny look. Is there a product or a way that would prevent the decals from appearing too shiny?

Thanks for your help!

Tags: Decals

Stef

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