Anthony Kesterton Posted July 18, 2021 Share Posted July 18, 2021 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? Link to comment Share on other sites More sharing options...
Twobad Posted September 12, 2021 Share Posted September 12, 2021 I tend to use a cellulose based etch primer. It's a bit aggressive really but it does cling to most things, even brass. Link to comment Share on other sites More sharing options...
Anthony Kesterton Posted September 23, 2021 Author Share Posted September 23, 2021 Thanks, will try that. I also had another go after washing the resin part a lot more and leaving it to cure for a lot longer. Will see how it goes. Link to comment Share on other sites More sharing options...
The wooksta V2.0 Posted September 23, 2021 Share Posted September 23, 2021 I'm using the usual Halfords primer for the aircraft I have on the go. Link to comment Share on other sites More sharing options...
spruecutter96 Posted September 24, 2021 Share Posted September 24, 2021 (edited) 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 September 24, 2021 by spruecutter96 Correcting a typo. 1 Link to comment Share on other sites More sharing options...
Anthony Kesterton Posted September 24, 2021 Author Share Posted September 24, 2021 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. Link to comment Share on other sites More sharing options...
busnproplinerfan Posted September 24, 2021 Share Posted September 24, 2021 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. 1 Link to comment Share on other sites More sharing options...
BKirwan Posted October 13, 2021 Share Posted October 13, 2021 I use Mr Surfacer. I have yet to paint over it but notice no real issue when handling the piece. Link to comment Share on other sites More sharing options...
TheBaron Posted October 15, 2021 Share Posted October 15, 2021 Can confirm that Alclad's black primer/microfiller clings happily to Elgoo's standard grey resin. 1 Link to comment Share on other sites More sharing options...
The Spadgent Posted October 16, 2021 Share Posted October 16, 2021 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? Link to comment Share on other sites More sharing options...
Anthony in NZ Posted October 19, 2021 Share Posted October 19, 2021 I have had this issue before with resin parts. I brought an Automotive 'surface prep' product, I think it is called a wax and grease remover. Anyway problem solved as my Mr Surfacer now sticks no problem Cheers Anthony Link to comment Share on other sites More sharing options...
dcsmax Posted October 28, 2021 Share Posted October 28, 2021 I use Stynelrez / One shot / Mr Primer& Mr Surfacer. Covers the Sirayatech resin beautifully. Link to comment Share on other sites More sharing options...
Brandy Posted January 18, 2022 Share Posted January 18, 2022 I use Tamiya acrylics as "primer", just to make sure no further work is necessary. That's for any and all types of part, and I've never had any problems so don't see any need for specialist primers myself. Ian Link to comment Share on other sites More sharing options...
Harlequin Posted January 18, 2022 Share Posted January 18, 2022 I've had a 3d printer for some time now and have been using Vallejo primer with no problem. If the primer is coming off I'd say it's surface contamination. When a resin print comes out of the printer it needs to be well washed with the appropriate cleaner, usually isopropyl alcohol. It then needs to be cured with UV light. Inadequate cleaning or during can leave an almost greasy layer on the surface so you could try giving it a wipe over with some IPA, it shouldn't damage the print at all. Link to comment Share on other sites More sharing options...
Pin Posted January 18, 2022 Share Posted January 18, 2022 +1 for Mr.Surfacer Link to comment Share on other sites More sharing options...
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