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Does putty fog up clear parts?

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  • Member since
    March 2017
Does putty fog up clear parts?
Posted by theflyingdutchman on Tuesday, July 13, 2021 11:30 AM

Hi all,

After gluing the canopy of my airbus a400m to the fuselage with white glue there happened to be gaps where the canopy and fuselage meet. I wanted to apply putty to fill the gaps, but I am worried that the putty will cause the windows to fog up.

The putty that I use is Bondo Spot and glazing putty. Will it cause the clear parts to fog up?

Thanks

Tags: question
  • Member since
    September 2006
  • From: Bethlehem PA
Posted by the Baron on Tuesday, July 13, 2021 11:44 AM

I don't know if your putties would cause the reactions that produce the frosting on clear parts.  But you could always use the same white glue you used to attach the parts, to fill the gaps, too.

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  • Member since
    April 2020
Posted by Eaglecash867 on Tuesday, July 13, 2021 11:48 AM

Bondo putties are polyester based IIRC, and they will fog the hell out of your clear parts just from the vapors coming off of them as they cure.  Better to use an epoxy putty like Apoxie Clay for a permanent solution.  You can use plain old water to smooth that down and remove the excess, so it also eliminates the sanding you would have to do with Bondo putties.

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  • Member since
    August 2014
  • From: Willamette Valley, Oregon
Posted by goldhammer on Tuesday, July 13, 2021 12:06 PM

If you have any perfect plastic putty, you can use that as well, and remove excess and smooth with a damp qtip.

  • Member since
    March 2003
  • From: Towson MD
Posted by gregbale on Tuesday, July 13, 2021 1:06 PM

Any product containing volatile solvents could possibly haze clear parts.

Alcohols, not so much...but stuff like mineral spirits and acetone (to name but a few) do not usually "work and play well with" materials like styrene-type plastics.

Acrylics and plastic-based puttys are safe, as are some varieties of epoxies. The latter should be tested first, just in case.

Note that clear-part fogging from CA adhesives can usually be removed with denatured alcohol, since it tends merely to rest on the surface. More volatile solvents, however, can actually etch those surfaces...leaving sanding/polishing or replacement as (usually) the only effective options.

Greg

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  • Member since
    August 2005
  • From: Mansfield, TX
Posted by EdGrune on Tuesday, July 13, 2021 4:04 PM

theflyingdutchman

Hi all,

The putty that I use is Bondo Spot and glazing putty. Will it cause the clear parts to fog up? 

Bondo Spot putty (Bondo Red) is a solvent putty.  Hazing clear is a threat 

Bondo Pro is a 2 part catalyzed epoxy putty. Less of a threat

I think I would go with Milliput, Perfect  Putty, or Vallejo which are water smooth & cleanup 

  • Member since
    November 2008
  • From: Central Florida
Posted by plasticjunkie on Thursday, July 15, 2021 1:30 PM

goldhammer

If you have any perfect plastic putty, you can use that as well, and remove excess and smooth with a damp qtip.

 

Another vote for PPP. You apply it then let it set for a few minutes and use a water dampened q tip to get a smooth fill area. Bondo will fog the clear parts for sure.

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