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Post by Dave N on Mar 15, 2009 0:14:12 GMT 1
I am having trouble getting the paint to stay on the brass. I have cleaned the parts with white spirit, primed with Humbrol primer and then top coated them but after 24 hours the paint has not stuck to the brass. HELP
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Post by Mikey on Mar 15, 2009 0:54:49 GMT 1
What type of primer are you using? Most hobby primers are designed for plastics or wood which have a porous or textured surface, unlike clean metals which are smooth and non porous. For metals it's advisable to an etching primer which, for a want of a better description, melts into the surface of the metal and provides a paint base. Also, after cleaning make sure all traces of spirit have been removed as this can act as a thinner for some types of paint. One thing to be cautious of is that some solvents may leave a chemical residue which can impare the effects of primer. One final point, most of this has been discovered from some personal experience but is no way conclusive. I look to our fellow member to expand and correct any information here. A bit long winded, but I hope this helps.
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Post by Dave N on Mar 15, 2009 10:17:24 GMT 1
Thanks Mikey, I was trying to use Humbrol No.1 matt primer, which brand of etching primer would you recomend and where can I buy it Thanks
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Post by Mikey on Mar 15, 2009 23:31:55 GMT 1
Well, If you intend to use an airbrush a company I've bought from, Phoenix Precision Paints( on line site for catalogue and ordering info). Suppliers to mainly model railway enthusiasts, they do etching primers and also have a hints page with some useful instructions. One thing to mind is that as etching primer requires it's own special thinners for cleaning the airbrush as it will attack the metal parts. If you want to avoid any complexities, some modelers use primers in a spray can. Halfords do a useful primer and Tamiya do a fine primer for plastics and metal available from many on line stores. just google :tamiya fine primer. Of course care must be taken with aerosols as they spray at a high rate, but if you follow the instructions you can get a good finish. Best to practice on some waste material to get the feel for the spraying technique. Hope this helps...
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Post by Dave N on Mar 16, 2009 10:02:21 GMT 1
Thanks again Mikey, I think I'll give the Tamiya fine primer a go as I've seen on the site that some others have used this product
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Post by chris on Mar 16, 2009 14:22:17 GMT 1
i've used those little paints u get from model shops and after 2 coats is's fine?
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Post by popeye on Mar 17, 2009 14:37:01 GMT 1
Dear Dave If you are in the UK then Halfords (the car parts warehouse) do a general grey undercoat/primer spray for car bodies which I use and it works very well. I don't spray directly, as it is a somewhat coarse spray nozzle intended for large car body areas. I spray into a small container and then use a fine brush. They do 2 types, one for spraying on metal, which works well on the Bismarck brass bits, and one for spraying on resin (e.g. fibreglassed areas of the car body) which I used on the Bismarck hull, after I had applied a thin fibreglass and resin coating to waterproof and strengthen the hull (see details in my photo area via Popeye's build in the Build Diarys section) The hull fibreglassed and resined (the 80gm/sq m fibreglass is transparent when the resin has been applied) The fibreglassed hull primed with grey car paint for resin surfaces. The surface has been marked ready for the final painting. You can see the former that was used to mark the lines. With the boat on a flat surfave (the kitchen table), the former is slid around the table so that the fibre pen point marks out a constant height line. The piece of white plastic is then put under the former (as shown) to lift the pen point up so the second line can be drawn, which defines the waterline black paint area. The main mast and base, which has been partially painted with the Halfords gray primer for metal surfaces. This was done some many months ago and the primer has stayed firmly on, even when the railings get bent as I fix other things on !!
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Post by Dave N on Mar 18, 2009 9:52:06 GMT 1
Thanks Popeye, I'll give the Halford's primer a go as I have not yet found a local stockist for the Tamiya fine primer and I have a Halfords about 5 minutes walk away. Thanks again Dave
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Post by southendnick on Mar 19, 2009 0:17:32 GMT 1
I'll probably go for Boeing Green Aircraft Primer! next time there is a job on the jet.
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Post by nm on Mar 19, 2009 8:27:36 GMT 1
Going to vulcanize the brass then, southendnick?
nm
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Post by chris on Mar 19, 2009 12:38:45 GMT 1
like i said earlier buy the small enamel pots they've worked fine for me.
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Post by Mark on Mar 19, 2009 13:16:54 GMT 1
Going to vulcanize the brass then, southendnick? nm LOL i used a green primer, Metalact 15 on Polly. Sticks like crazy, but I gather it's banned in the UK due to some nasty chemical that it contains. Apparently Korean shipyard workers are immune
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