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Priming resin parts


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I bought a 3D print of the Dragon space capsule recently (before I bought my printer), washed it carefully then primed with Tamiya fine primer from a can. After doing some sanding and filling, I washed again in warm water with some washing up liquid. To my horror, all the primer came off with some light rubbing with a brush. 

The 3D part is a resin SLA printed part. 
 

Any recommendations on primer for these kinds of printed parts?

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  • 1 month later...

I tend to use a cellulose based etch primer. It's a bit aggressive really but it does cling to most things, even brass.

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  • 2 weeks later...
18 hours ago, The wooksta V2.0 said:

I'm using the usual Halfords primer for the aircraft I have on the go.

I would second that. It's designed to stay stuck to the exterior of cars in all weathers and tempertaures, so some 3D printed material should be no major issue for it. And, bang-for-your-buck, it's cheaper and much easier to find than most modelling products. 

 

Chris. 

Edited by spruecutter96
Correcting a typo.
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I should have some Halfords primer kicking around here too - will try that next if the Tamiya does not stay on. I was surprised how easily the Tamiya primer came off when I had to wash the parts after priming (they got a bit dusty).  It might be poor curing of the resin or surface grease/stuff.

 

 

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I don't have much experience yet on 3d printed parts. But for resins I try to use plastic adhesion promoter. It's from bodyshop suppliers. It's used on plastic car parts before any primers go on, seems to have worked so for.

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  • 3 weeks later...

I have just primed my newly printed parts with Tamiya grey and all seems good. To be fair I never wash with washing up liquid and a brush afterward. Maybe just run under a tap if you need to? 
 

 

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