Re: [Chrysler300] Sheet metal fabrication question - H trunk floor

["Carlton Schroeder" <schroe99@xxxxxxxxxxxx>]

Thanks Ron, and to all the other members who gave me many good comments and suggestions.  It really is great to have such good and timely advice available through our Club list server. 

>From CARQUEST I bought a 13 oz. spray can of 3M Weld-Thru II to try.  The price was $33 which was an unpleasant surprise.   3M describes it as "A Weldable, Corrosion Resistant Coating".   It is not a primer and is intended only for areas that are enclosed by the welding.  The store had many "cold-galvanizing" paints (so did Menards) that were much cheaper but I don't think those were intended for welding.

The sheet metal I'm using is an "aluminized" (I think that was the term) type of sheet metal which resists rust when it is just sitting in the garage or shop.  The trunk floor stiffeners were OK and I'll cleanup and reuse / reattach them after coating the inside (to be enclosed) surfaces.  

The 3M coating has zinc, zinc rich primer, and aluminum in it along with a number of volatiles.  3M recommends good ventilation when applying the paint and normal ventilation used for welding when doing the welding.  There is no special precaution on the can that might be used if you were trying to weld galvanized metal.

Carlton Schroeder
Eagle River, WI




  ----- Original Message ----- 
  From: Ron Waters 
  To: Chrysler300@xxxxxxxxxxxxxxx 
  Sent: Thursday, June 18, 2009 3:42 PM
  Subject: Re: [Chrysler300] Sheet metal fabrication question - H trunk floor





  I would be careful with 'weld thru primers' aka cold galvanizing compound, 
  which contain zinc. When trying to weld an already galvanized surface, you 
  will be breathing the burning zinc compound, which is bad for your lungs. I 
  learned the hard way when I first started welding about 15 years ago. You 
  will cough for days. I also found that the welds made thru the compound 
  tended to be inferior in quality, since you are introducing an additional 
  metal into the mix.

  I would recommend spraying the galvanizing compound into the sealed section 
  after welding is completed, possibly by drilling a small hole. 
  Alternatively, you could pour some POR-15 or Bill Hirsh Miracle Paint into 
  the hole.

  Ron 



  

[Non-text portions of this message have been removed]



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