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Post by Oldtimer on Apr 1, 2022 13:19:43 GMT -8
I got some pieces through Shapeways which are printed in what they describe as White Natural Versatile Plastic. I need to fill a couple of features on one of the pieces, and wondering what to use. I work primarily in diecast and plastic, so if I have the same issues with those materials, depending on the size of what I am trying to repair, I use either JB Weld or Bondo. Anyone got any tricks up their sleeve? Thanks!  
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Post by Chris K. Hale on Apr 17, 2022 5:55:55 GMT -8
JIm, I have had great results first using Plasticolor or similar Automotive grade Spot Filler Primer on the 3D printed parts, it will eliminate a lot of putty or filler work and smooth the semi-rough part out. As far as a filler goes I used Bondo spot filler putty as a glaze to fill and smooth. One thing I also tried and had some results from was Baby Powder mixed in CA Glue, it dries really fast and very hard so practice a bit if you go this route. I hope that helps and I apologize for taking this long to post on the subject... Chris
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Post by Oldtimer on Apr 17, 2022 7:35:24 GMT -8
Thanks for the reply!
I had heard of CA glue, but never worked with it.
In filling the large NACA duct holes, I'm wondering if I cut out the plastic in the ducts, and covered the backs of the holes with masking tape, if the CA/Baby Powder solution could be brushed over to create an outer skin?
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Post by Chris K. Hale on Apr 17, 2022 8:01:56 GMT -8
I should have said Super Glue, Maxi Cure or any of those type cements are CA glue, No I would cut out the area you dont want and make a styrene filler panel, glue in place with a Super glue type cement then when dry just fill the edges with Bondo spot putty. I do that kind of thing all the time. I know you saw the 1964 Corvette build I did , there is some good info and pics on this type of surgery..https://race-car-models.proboards.com/thread/1452/mpc-1964-corvette-kit-1 Chris
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Post by Oldtimer on Apr 17, 2022 18:35:35 GMT -8
I should have said Super Glue, Maxi Cure or any of those type cements are CA glue, No I would cut out the area you dont want and make a styrene filler panel, glue in place with a Super glue type cement then when dry just fill the edges with Bondo spot putty. I do that kind of thing all the time. I know you saw the 1964 Corvette build I did , there is some good info and pics on this type of surgery..https://race-car-models.proboards.com/thread/1452/mpc-1964-corvette-kit-1 Chris Okay. I obviously use Super Glue all the time. Might try to lay in some styrene sheet and cross my fingers. Thanks! |
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Post by arcticwolf on Apr 19, 2022 7:12:23 GMT -8
I use 3D printed parts when I can find them. They have great detail but I really don't like the surface texture. Doesn't matter much for an injector set but I've never tried a body part made from it! I'm really curious how you handle this one Jim!
As to your ducts, I wouldn't cut out anything if you can avoid it, that stuff's really brittle. I'd just glue in some sheet styrene and then sand it back down flush if it were mine. Using a gap filling CA might help.
Good luck man..
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Post by Oldtimer on Apr 26, 2022 8:10:31 GMT -8
Thanks for all the input and insight! So, trying the suggested solution. Laid a piece of masking tape over the offending holes.  Cut out a piece of styrene using the pattern.  Glued it in with SuperGlue, held in place with some masking tape. Here's where we are after a little bit of 80 grit sanding.  Got the back hole piece glued in place now, going to wait for it to cure, and then sand them both down and add some Bondo. |
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Post by Oldtimer on Apr 27, 2022 15:56:09 GMT -8
This is the first pass with Bondo.  Getting close, but put another coat of Bondo on after this picture. 
I think this approach is going to work, pondering a coat of primer after the next sanding. |
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Post by arcticwolf on Apr 28, 2022 3:18:56 GMT -8
Bondo, as in automotive body filler?
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Post by Oldtimer on Apr 28, 2022 11:29:52 GMT -8
Bondo, as in automotive body filler? Yup. 
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