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Mick Bonwick's Blog

A blog by Mick Bonwick in RMweb Blogs

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A record of weathering work, intended to show both good and bad results, including explanations of what is used and how.

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Page 5 of 8

Dapol O Gauge 14xx No. 1444

Who hangs on to old tins of paint, wherein gloopy remains stick to the bottom? I have an old tin of Humbrol 27004 Metalcote Gunmetal, most of which was used for airbrushing onto wheels and smokeboxes in a black/gunmetal mixture. During a search for suitable buffer head grease I found that the otherwise unusable pigment that remained in the bottom of an improperly closed tinlet had an interesting property. A lump of this goo was attached to a buffer head, smeared about a bit and left to dry. Once

Mick Bonwick in Weathering

November 21, 2020

2

Dapol O Gauge 14xx No. 1444

Almost there now. Some MIG Dark Mud pigment has been used to indicate the beginnings of surface corrosion on the chimney, and some Gunmetal metallic pigment has been used to indicate the beginnings of shiny handrail portions in the most used areas. Small amounts are crucial to the success of this type of effect. All pigment applications were done with a filbert brush. Only one more day to go.

Mick Bonwick in Weathering

November 20, 2020

3

Dapol O Gauge 14xx No. 1444

A dark mix of Railmatch Weathered Black and Frame Dirt has been airbrushed over the top of the boiler, the cab roof and the driving wheel centres. This is to represent the soot present on the former two and the oil on the latter. The photograph that I have been using as a reference shows a much more marked contrast between the wheel rims and the wheel centres, but it does not look quite right to my eye so I have reduced the contrast by using a slightly darker shade of brown. Black Sm

Mick Bonwick in Weathering

November 19, 2020

3

Dapol Mogul 6324

No blow-by-blow account for this subject, just a photograph of the end result. Airbrushed Railmatch Frame Dirt for the underparts, with Weathered Black addded for the sides and ends. Weathered Black for the tops of smokebox, boiler and cab, with Mig Productions Black Smoke pigment on the smokebox and cab roof. Small quantities of Mig Productions Industrial City Dirt, Dark Mud and Track Brown in appropriate places around and about and some AMMO by Mig Fresh Engine Oil on the coupling/

Mick Bonwick in Weathering

February 22, 2021

6

D3721. The Summary.

In response to a recent request, there follows a summary of materials used in this project with the blog entry numbers where they appeared. Railmatch Frame Dirt - Step 3. AMMO by Mig Panel Line Wash Black Night - Step 12. Railmatch Weathered Black - Steps 13 and 15. AK Interactive Fresh Engine Oil - Steps 14 and 21. MIG Productions Dark Mud - Step 18. MIG Productions Track Brown - Step 18. MIG Productions Black S

August 24, 2018

10

D3721. Step 9.

The locomotive has been removed from the cradle and further light coats of frame dirt applied. The next task is to spray from above the chassis components to cover areas inevitably missed while it was upside down - particularly the steps, axleboxes and sandboxes. There is some overspray, but that will all help to make the bodysides and running plate look grimy once the next steps are completed . . . . . .

July 22, 2018

3

D3721. Step 8.

The frame dirt has now been airbrushed onto the frames as well, taking some care not to get overspray onto the body. This is not critical, but it helps to keep extra work to a minimum if I decide to spray the bodywork a significantly different shade of filth. With the locomotive upside down in the cradle, it is quite easy to ensure that the underneath of the running plate is covered. The accuracy of the airbrush also helps to keep unwanted paint off the wheel treads.

July 18, 2018

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D3721. Step 7.

Clean wheels. With the aforementioned battery applied to a pair of wheels, a cotton bud soaked in isopropyl alcohol has been applied to the wheel treads and the backs of the wheels. You should be able to see that all of the dried enamel paint has been completely removed from those surfaces that need to be clean for conducting electricity. Isopropyl alcohol will remove all enamel and acrylic paints from these surfaces, so you will need to take care with where you apply it.

July 17, 2018

3

D3721. Step 6.

Round to the other side of the chassis now. Same process, but you can see where the last rotation of the wheel has yet to be sprayed. Still no masking, and the small spray area resulting from coming up close has kept the overspray off of most of the frames. Turning the wheels with the battery is still keeping the backs of the wheels clear because the wiping action of the pickups is removing the still wet paint.

July 16, 2018

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D3721. Step 5.

The first few coats of paint have been applied. Each coat consists of a pass across the chassis to apply a very light coat of paint. This only results in a very slight discolouration of the wheels, or at least those parts of the wheels that show above the frames. The wheels are then turned a quarter of a turn using the battery and the exercise is repeated. You can see in the accompanying picture that there is still one small area on each wheel that needs to be covered. You can also s

July 11, 2018

0

D3721. Step 4.

Getting tools prepared. As already mentioned, the airbrush to be used is an Iwata HP SB Plus, with a 0.2mm nozzle for fine control when working close up. I'll be utilising this airbrush's ability to come in close and only cover small areas at a time. The glass dish contains clean white spirit, as does the plastic bottle to the left. The former is used during the mixing of paint to achieve the necessary consistency and the latter will be used to keep the internals of the airbrush clea

July 9, 2018

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D3721. Step 3.

For this project I have chosen to use Railmatch Frame Dirt on the underparts. This is not my usual colour for working on underframes, but I had some available so thought I'd give it a go. The airbrush I am using in this case is an Iwata HP SB Plus, because it gives me a great deal of control over the area to be covered for each pass along the model. When working on the whole length of a model, whether it is the chassis, bodysides or the roof, I like to have complete control over the

July 7, 2018

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D3721. Step 23.

Similar treatment has been given to the other side, and you might just be able to see where the same pigment has been applied to the cab end. I thought that the shine from the oily finish under the running plate was a bit too bright, so it has been dulled down a little with some dark brown pigment. This was applied in small quantities (heard that before?) with a soft brush. I think I'll finish this subject right here. Resist the temptation to fiddle!

August 23, 2018

4

D3721. Step 22.

To increase the level of accumulated dirt around the bodyside doors, some more pigment (MIG Productions Black Smoke) has been added with the filbert brush. By using small quantities again, the effect has been kept to a minimum. A little has been dragged downwards from the cab window and from the sloping top of the fuel tank. The cab roof has been treated and so has the area around the bottom of the oil filters. In all cases it has been just enough to disturb the even surface produced by using th

August 22, 2018

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D3721. Step 21.

The oily locations need to be made oily. I have used AK Interactive Fresh Engine Oil through the airbrush to add the oily shine to appropriate areas - axle boxes, bodyside filters and chassis areas. The photograph shows the application while still wet - it will lose some of the shine by the time it dries.

August 13, 2018

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D3721. Step 20.

I felt that more discolouration was needed around the bodyside filters and the axle box areas. More pigment has been applied to these areas to achieve this, and the same method used as before. MIG Productions pigments (shown in this blog) are now out of production, but the same colours are available from Abteilung 502 in the same shaped pots but with different labels.

August 12, 2018

0

D3721. Step 2.

High-tech cradle in use to support upside down model while underparts are dirtied. The battery is used to turn the wheels during airbrushing, to avoid paintless shadows from the connecting rods and to get to those parts of the wheels hidden behind the frames.

July 5, 2018

3

D3721. Step 19.

Pigments have been used to simulate the rusty surface of the exhaust silencer assembly. The technique is to pick up pigment particles from the lid of the pot rather than plunge the brush into the pot itself. This means that the finest particles are being used to apply to the subject. The brush used is a filbert, chosen for its soft but firm bristles and rounded shape. I like soft, firm and rounded. Only small quantities are used, because it is only a suggestion of rust, and not a fla

August 12, 2018

2

D3721. Step 18.

The main work has been done, and the airbrush can be set aside for a few steps. Weathering powders, or pigments as I tend to call them, come in a great variety of textures and colours. The ones that work best for me are from military modelling ranges and are exceedingly finely ground. This enables the particles to fall into the lower reaches of the matt surface's layer(s) and stay there beyond the reach of fingers and other abrasive effects. In this case I'm using MIG Productions col

August 10, 2018

0

D3721. Step 17.

The roof has been fixed. Not quite the same shade of dirt as the rest of the roof, but that is not a problem, because another layer will be applied at a later stage to tie it all together. This view of the other side shows up the effects of darkening areas affected by oily spillage (around axleboxes) and not controlling overspray to simulate dirt accumulation (areas just above the running plate).

August 8, 2018

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D3721. Step 16.

If you ever handle thinners inside the spray booth, make sure that your latest project is not in there as well! Lack of control of Bonwick fingers have resulted in a large blob of thinners landing on the roof. To deal with this, the section of roof has been cleaned so that I can start again. I said at the beginning of this blog that there would be bad things as well as good things reported!

August 7, 2018

3

D3721. Step 15.

The areas around the axle boxes are to be portrayed as oily and affected by accumulated gunge. The beginnings of this process incorporate a layer of Railmatch Weathered Black. This is applied thinly and from fairly close up, to control the area covered. Overspray onto the running plate is deliberately not avoided. In this photograph you should be able to see the result of applying the small amount of engine oil to the base of the bodyside filters.

August 6, 2018

3

D3721. Step 14.

Holiday over and back to work. The airbrush has been loaded with a small quantity of AK Interactive Engine Oil in order to replicate the oily residue at the bottom of the filters. I have masked off the underframe while doing the filter area, just a piece of card laid against the running plate. Only a very small area has been thus affected on this particular locomotive.

August 5, 2018

0

D3721. Step 13.

Once all of the panel line wash has been applied and allowed to dry completely (24 hours), it's time to start airbrush work on the body. Using the same Railmatch frame dirt as before, but mixing it with a little Railmatch weathered black, a very light misting is applied to the whole locomotive. Side, ends, top and underparts. This is deliberately not perfectly even, more being applied in some places than in others, because I don't want the end result to look as if it has had a perfectly even coa

July 28, 2018

2

D3721. Step 12.

There is a great level of detail on the body of this model, and it will look even better if it can be highlighted in some way. This applies to pretty much all of the ready to run rolling stock available these days. My plan for this shunter is to use a panel line wash applied to all the crooks and nannies with a rigger brush. What's a rigger brush? It has long bristles and a small point - some folks call it a lining brush. The idea behind using this type of brush is that the bristles

July 26, 2018

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