What was the metal 'finish' called.

#1
HELP!
Years ago when the MoD was called the WD .... a lot of equipment had a black 'crackle' finish on the metal work, usually anything electrical. This coating was not a Hamerite type finish, it had a texture, sometimes found on the casing of optical gear like binoculars.

Any information, if anyone can remember, would be appreciated
 
#4
I remember seeing some SMGs finished like that, as far as I recall it was just called 'Crackle Finish', but it looked way cooler than the plain black jobbies we got. It might have been for export purposes.
 
#7
There are three common types of metal paint finishes.. hammer finish, crackle finish and wrinkle finish. I think you are referring to wrinkle finish, which was a common pre-war finish for electrical cabinets etc.

Originally the effect was produced by stove heating. The trick is to lay on a fairly thick layer of paint and then to rapidly dry the surface layer, causing it to shrink and wrinkle. The paint needs to be fairly flexible so that it remains intact as it deforms.

Crackle finish is similar except that it is put on in layers. The top layer also shrinks as it dries, however it dries to a brittle finish which then cracks. It is usual to use different colours for each layer so that the bottom colour is revealed when the top layer cracks.

Hammer finish is down to the chemical makeup of the paint which causes it to "clump" as it dries..

You can buy specialist paints that will produce all the above effects..

Metal finishes such as phosphating and parkerising are hot chemical treatments applied to bare metal.
 
#8
Could it it be anodized? Blackened hard finish.
 
#9
There are three common types of metal paint finishes.. hammer finish, crackle finish and wrinkle finish. I think you are referring to wrinkle finish, which was a common pre-war finish for electrical cabinets etc.

Originally the effect was produced by stove heating. The trick is to lay on a fairly thick layer of paint and then to rapidly dry the surface layer, causing it to shrink and wrinkle. The paint needs to be fairly flexible so that it remains intact as it deforms.

Crackle finish is similar except that it is put on in layers. The top layer also shrinks as it dries, however it dries to a brittle finish which then cracks. It is usual to use different colours for each layer so that the bottom colour is revealed when the top layer cracks.

Hammer finish is down to the chemical makeup of the paint which causes it to "clump" as it dries..

You can buy specialist paints that will produce all the above effects..

Metal finishes such as phosphating and parkerising are hot chemical treatments applied to bare metal.
As much as I wonder at your ever ready supply of trivia and military knowledge HE117 I do have this image of you in a room full to Pams and Allied pubs, sitting with a cup of bovril and a backcopy of "Janes' all the Worlds Paints, Coatings and Surface finishes" in your sweaty mitts getting all excited over the next question someone throws onto the forum.

S_R
 
#11
As much as I wonder at your ever ready supply of trivia and military knowledge HE117 I do have this image of you in a room full to Pams and Allied pubs, sitting with a cup of bovril and a backcopy of "Janes' all the Worlds Paints, Coatings and Surface finishes" in your sweaty mitts getting all excited over the next question someone throws onto the forum.

S_R
Ther is **** all wrong with Bovril :)
 

ugly

LE
Moderator
#12
Ther is **** all wrong with Bovril :)
Can anyonne smell a brummie? I'm sure there's one in the room!
That said winter football matches nowt better on the terraces!
 
#14
As much as I wonder at your ever ready supply of trivia and military knowledge HE117 I do have this image of you in a room full to Pams and Allied pubs, sitting with a cup of bovril and a backcopy of "Janes' all the Worlds Paints, Coatings and Surface finishes" in your sweaty mitts getting all excited over the next question someone throws onto the forum.

S_R
Cheeky sod...!

However I suspect it is a reflection of my upbringing as a "traditional" Ordnance Officer..

I can remember one of my bosses, who was considered (and probably was) the GLE on the correct form of military dress*, describing the difference between an Expert and an Ordnance Officer as the first being someone who knows more and more about less and less, and the latter as being someone who knows less and less about more and more...!

I contend that my affliction is one for which there is a necessary place in modern warfare, and the lack of which is costing us dearly at the present time...

... and I don't like Bovril!

Sua Tela Tonanti!

* I recall him giving me a short lecture on the correct procedure for procuring turbans for Sikh troops! As best as I remember it is:

Mat Regs authorises the local purchace of 6 yards of suitable material as follows:
1. 3 yards of material in the colour of the top of the No1 dress hat to make up the outer wrapping of the turban, known as the puggaree.
2. 3 yards of material in the colour of the regimental facings to make up the core of the turban, known as the pag.
3. Conversion of 2 regimental cap badges with a brooch fitting.
4. All funds to be recovered via regimental imprest.

...Replaces dog eared copy of 1948 Mat Regs and drinks slug of lapsang souchong...
 
#15
Could it it be anodized? Blackened hard finish.
Nope... Anodisation can only be applied to aluminium..

sorry - I just know this stuff!

..Sigh
 
#17
The (smooth) blacking used on firearms was Suncorite 259. This is one of a family of coatings used in industry for pipelines, etc. Its possible the crinkle finish (as on commercial Sterling SMGs) was one of the related coatings.
 

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