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Gluing to paint

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  • Member since
    April 2020
Gluing to paint
Posted by 58volvoV8 on Sunday, April 26, 2020 4:02 PM

ok we all know the golden rule that paint and plating need to be scraped befor gluing to get a styrene to styrene bond,especially with cements that"weld" plastic together......but what about little trim things like wipers and door handles??? Do you guys actually scrape your freshly painted bodies?? I've all ways just super glued right to the paint,even glass I just white glue right to whatever paint is there....used to use testors cement carefully befor I learned about white glue..but still to the paint.

  • Member since
    December 2003
  • From: Nova Scotia
Posted by Bainford on Sunday, April 26, 2020 10:02 PM

Really, you only need to scrape when using model cement, as it needs bare plastic to make a good bond. However, without scraping, the bond will only be as strong as that of the paint, regardless of the type of glue. 

A better idea is to pin the parts to be attached to a painted body. I use 1/32" or .025" brass rod. Drill a small hole the size of the pin in the mirror base or door handle etc. Cut a pin, deburr the end, and glue it in the hole with CA. I leave the pin about 1/2" long to make the small part easy to hold, assist painting, etc. Drill a hole the size of the pin through the body. You will have to run the drill through again after painting. During final assembly, insert the pin through the hole in the body, glue from inside the body with CA. If needed, cut the excess pin length with wire cutters after the glue has set. Strongest possible joint, and with zero trace of glue. 

"It would be unusual, if the unusual didn't occur."

- Steamboat Gariepy

Trevor

  • Member since
    December 2003
  • From: Nova Scotia
Posted by Bainford on Sunday, April 26, 2020 10:12 PM

"It would be unusual, if the unusual didn't occur."

- Steamboat Gariepy

Trevor

  • Member since
    April 2020
Posted by 58volvoV8 on Monday, April 27, 2020 9:47 AM

wow...thats a good idea I never would have thought of....ill have to do some expieramnenting thank you

  • Member since
    April 2020
Posted by 58volvoV8 on Monday, April 27, 2020 4:21 PM

would bits of guitar string work?? I have plenty .024 strings lying around...i know I make carb linkage with them

  • Member since
    August 2015
  • From: Hamptonville, NC
Posted by TarheelRick on Tuesday, April 28, 2020 7:13 AM

This is a very good and efficient technique.  I have used it on larger pieces.  I just fabricated a racing bumper for a car I am building, but I needed to be able to remove it for paint, plus it was a butt joint to the car chassis - not a very substantial joint.  My only issue is being able to hold a door handle or very small part to drill the hole.  Any suggestions on how that is done?

 

And 58volvo, yes the guitar string will work.

I build models because I can't afford the real thing!

  • Member since
    December 2003
  • From: Nova Scotia
Posted by Bainford on Tuesday, April 28, 2020 10:21 AM

TarheelRick

My only issue is being able to hold a door handle or very small part to drill the hole.  Any suggestions on how that is done?

 

Rick, holding tiny parts while working them is my biggest pain, especially when scratch building. I have a couple of cheap hand vices that are helpful for some things, but no real solution for others. More than once I've drilled a .020" hole in my thumb. 

"It would be unusual, if the unusual didn't occur."

- Steamboat Gariepy

Trevor

  • Member since
    December 2003
  • From: Nova Scotia
Posted by Bainford on Tuesday, April 28, 2020 10:30 AM


58volvoV8

would bits of guitar string work?? I have plenty .024 strings lying around...i know I make carb linkage with them

 

Guitar string is one of my favourite scratch building materials. I keep several sizes on hand. Very handy material. It can certainly be used for pinning, though I find it harder to work with than brass for this purpose.  Deburring the end can be difficult, I use a fine stone instead of a file to deburr guitar string. If the string has a shiny plated surface, I'd give it a rub with emory paper to provide a surface the glue can grip. 

"It would be unusual, if the unusual didn't occur."

- Steamboat Gariepy

Trevor

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