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Dispelling Modeling Myths


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#101 AzTom

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Posted 23 May 2013 - 05:24 PM

 

Jim, The Bondo brand Spot & Glaze putty you show here does not use a hardner.  It will set in minutes right out of the tube if used as intended, thin coats.  

 

 

I use the same putty, it does require a hardener, as it is a 2 part putty. There is a single part putty made by Bondo, that is in a similar tube.

 

 

 

 

 

 

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You do learn something here every day.  I have been using Spot & Glaze putty on models and real cars for 40 years and never saw a two part type.

 

The tube I have looks like that tube, but not sure about the "Professional" name. That said, it's probably 10+ years old.  Mine is red and dries in minutes. I like it because you don't have to mix it and it dries quick.



#102 zenrat

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Posted 24 May 2013 - 01:17 AM

 

Is it really the plastic "bleeding through?" Or more a case of a light color paint needing more coats to fully cover a brightly-colored plastic?

 

It's the plastic (or some chemical contained therein) bleeding through.

I know this because I have sealed red plastic with tamiya primer, put white overcoat on top which remained white and then hit it with too heavy a coat of clear that caused the whole thing to turn pink.

Point being that no red showed through the white until I put down the clear.



#103 Hollywood Jim

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Posted 25 May 2013 - 07:14 AM

Here is information form the Bondo website.

 

They have one part putty.  Bondo 907.

 

Slide1-vi.jpg

 

 

I use the two part putty.  Bondo 801.

 

Slide2-vi.jpg

 

 

I think if you use one part putty of ANY kind, and you apply paint over it before it is completely dried; it will shrink. 

One part putty applied in thin coats will not shrink if it is allowed to completely dry before you paint over it. 

 

But to be safe I use 2 part putty so i don't have to worry about how thick I apply the putty.

 

 

 

.



#104 Harry P.

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Posted 25 May 2013 - 07:23 AM

If it says "Professional" in the name, it's the 2-part stuff. Bondo "Professional" Glazing and Spot Putty. You have to be careful because their 1-part stuff comes in an almost identical looking package.



#105 sjordan2

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Posted 25 May 2013 - 07:26 AM

I would assume that the 2-part putty discussion has mostly to do with bodywork and very visible parts. I don't see a downside to using 1-part putty for things like covering seams, sink marks, etc., in engine block halves, radiators, drive shaft halves, bell housings (where appropriate) etc.



#106 Hollywood Jim

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Posted 25 May 2013 - 07:42 AM

I think the history of shrinking putty comes from building models in our younger years. 

 

When I was a young boy I used to slop on the one part tube putty in thick clumps when doing body work.  Then as soon as I could sand it, I would sand it.  Then right after sanding it I would paint it.  Just like most kids I was in a hurry to finish the model.  And sure enough the putty would still be curing and a few weeks / months later it would show signs of shrinking.

 

 

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#107 Danno

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Posted 25 May 2013 - 07:56 AM

Late to the game . . .

 

Hey, Jim,

 

Does the 801 come with hardener in the package or do you have to buy it separately?

 

 

 

(See you this afternoon!) 



#108 Harry P.

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Posted 25 May 2013 - 08:00 AM

In the package.



#109 Hollywood Jim

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Posted 25 May 2013 - 08:27 AM

Late to the game . . .

 

Hey, Jim,

 

Does the 801 come with hardener in the package or do you have to buy it separately?

 

 

 

(See you this afternoon!) 

 

I brought it sometime more than a week ago so I don't remember.....  LOL

 

A tube of this stuff lasts me a long lone time.  A few years ago I even had to purchase some extra hardener.

 

Yeah, see you later today !!

 

 

.



#110 Danno

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Posted 25 May 2013 - 09:53 AM

In the package.

 

 

As McAuliffe and Patton said to von Luttwitz:  "T'anks."   ;)