SCleaning parts before assembly and painting

airfixian

29 posts

When cleaning parts in water and detergent is it enough to just let them soak, or do you have to brush the parts down?

sr owen

Rocket Ron.

59 posts

I add a splash of vinegar to the soapy water and give the sprues a light going over with a soft nailbrush.It seems to work.

Patrick Camilleri

380 posts


Community Moderator

I use a toothbrush. Not my own... I have one dedicated tomy models Laughing

Biggyinn

97 posts

The toothbrush comment was so good it appeard twice!

Patrick Camilleri

380 posts


Community Moderator

Thanks for pointing out the double post Biggyinn.  I've removed it.

wijnands

30 posts

I did a test recently. Took one sprue, applied primer. Took another sprue and sloshed it around in some warm water with dishwashing soap. Then primed it. Primer on the second sprue adhered a LOT better.

I have only ever bothered cleaning parts if they were resin, but perhaps i should do the same with normal plastic as well. Is the release agent the main reason for washing ?

Mattoo

1 post

@graham martin

I have only ever bothered cleaning parts if they were resin, but perhaps i should do the same with normal plastic as well. Is the release agent the main reason for washing ?

I think so, though I'm led to believe that's only an issue with resin or other less mainstream manufacturers.   I often wash with soapy water after building but before painting just to wash any dust and debris off and any oils from my own sticky fingers.   I also imagine that with "hot" paints it's less of an issue but acrylics might not be able to bite through any grime so well.

Paul Brown

548 posts


Community Moderator

@Mattoo

 

I think so, though I'm led to believe that's only an issue with resin or other less mainstream manufacturers.

 

Resin casters need to use a generous amount of release agent, especially if the casting has deep undercuts. Excessive release agent is not usually a big issue with mainstream maunfacturers, although you might come across it from time to time and it's pretty obvious when it happens. I mostly use hot primers and lacquer based acrylics and other than giving the surfaces a wipe I don't usually wash them with any detergent. So far paint adhesion has not been a problem.

LeonF

23 posts

I rarely wash sprues and have had few issues with the standard plastic kits and  acrylic paints.

However there are exceptions to every rule and Airfix (and some old Italeri) kits do throw up the occasional concerns. The most problematic was the blue-grey plastic used by Airfix for a few years which seemed to ooze oil. Thankfully the more recent  kits moulded in grey are much better in this respect.

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