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Priming parts on the sprue?

9 replies
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  • Member since
    October 2020
Priming parts on the sprue?
Posted by rcguy on Wednesday, December 2, 2020 3:11 PM

I recently read that some people prime all there parts while still on the sprue.

Is this common practice or is it even a good idea.

Seems like it could save some time I don't know being pretty new to this stuff.

I don't airbrush primer I use Tamiya rattle can fine primer which kinda goes everywhere anyway.

  • Member since
    April 2020
Posted by Eaglecash867 on Wednesday, December 2, 2020 3:21 PM

I think its a matter of personal preference and build style.  I never prime anything while its still on the sprue.  The reason I don't is because I like to give each part individual attention to make sure I get all of the flash off and remove pin marks from areas that will be visible.  Also, there are a lot of subassemblies that it makes more sense to have cemented together...seams removed, etc. before primer goes on.  To hold small items for priming/painting/drying, I use toothpicks and a hot glue glun.  Chop off the point on one end to get a decent surface area for the glue, attach the part at a spot that won't be visible, prime/paint while holding the toothpick, and then you can stab the pointy end of the toothpick into the edge of a roll of cheap masking tape to give it a place to sit while it dries.

"You can have my illegal fireworks when you pry them from my cold, dead fingers...which are...over there somewhere."

  • Member since
    November 2008
  • From: Far Northern CA
Posted by mrmike on Wednesday, December 2, 2020 3:39 PM

Sometimes it makes good sense to me to prime and/or paint things on the sprue. A good example would be fuel tanks, bombs and other munnitions. I find that by removing as many attachment points as possible, gluing and priming, I've got parts that are (mostly) ready for paint, and still have a "handle". I like to use alligator clips on skewers to hold small stuff for paint, sticking the sharpened ends into styrofoam blocks.

Other assemblies can benefit from staying on the sprues, if it's easy to mask glue attachment points. 

  • Member since
    September 2012
Posted by GMorrison on Wednesday, December 2, 2020 4:08 PM

i usually do, but then you need to scrape off the paint if you are using solvent glue. THat isn't hard though.



 Modeling is an excuse to buy books.


  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Friday, December 4, 2020 7:16 AM

I frequently do that. Saves time.  Does require a slight touchup at sprue attachment points.  I dont bother to prime these areas, usuallycovered during painting, but may a slight touchup with fine brush.


Don Stauffer in Minnesota

  • Member since
    October 2019
  • From: New Braunfels, Texas
Posted by Tanker-Builder on Friday, December 4, 2020 11:06 AM

I would say this;

 Each of us has a preference. Now in reality I would say Ditto to Fermis and Bill. It's overall easier that way. I have re-learned that lesson on the two 1/48 scale A-10s I am piddling with!

  • Member since
    January 2020
  • From: Maryland
Posted by wpwar11 on Friday, December 4, 2020 5:27 PM

I almost always prime and paint on the sprue.  When I started modeling I found how to hold the part a challange.  The sprue creates a nice handle.  

  • Member since
    March 2003
  • From: Western North Carolina
Posted by Tojo72 on Friday, December 4, 2020 5:39 PM

I really can think of only a handful of instances where I would want to prime and paint on the sprue,perhaps landing gear,landing gear doors,the basecoat of a fuselage half but usually I'm assembling then painting.

Depend a lot on the subject 

  • Member since
    March 2015
  • From: Close to Chicago
Posted by JohnnyK on Friday, December 4, 2020 7:40 PM

I like using a spure  as a handle when I paint parts, especially small parts.

This is a photo of the parts for a 1/12 scale Tamyia kit. There are numerous  very small parts. I would find it very difficult to paint those parts after they were removed from the spures.I painted the parts while they were still attached to the spures and did minor touchup as required. In fact, the only only parts that I painted after I removed them from the spure were some of the blue body panels.

Youe comments and questions are always welcome.

  • Member since
    November 2018
Posted by oldermodelguy on Sunday, December 6, 2020 5:15 AM

I pretty much 2nd what Johnny K said, his mo is same as mine in general. You do what you gotta do that's all. But one way or another everything but chome or clear parts get primed. And quite a lot of parts get color right on the trees/spru.


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