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: To sandblast or not to sandblast.  ( 5108 )
Pierre Bester
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« : October 28, 2009, 03:19:39 PM »

Well, why or why not?

Jonathan Tee
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V8 because some say "2 heads are better than one"


« #1 : October 28, 2009, 03:42:09 PM »

Personally I would sandblast for the following reasons:

  • the old primers and paints were not as advanced as the modern etch primers and paint technology
  • the old primers and paints will have become porous with age
  • there is evidence of sub-coating corrosion on several sample panels
  • you uncover any previous repair/filler work, that may remain hidden otherwise
  • better adhesion of products to fresh metal
   
« : October 28, 2009, 05:25:34 PM Jonathan Tee »

Pierre Bester
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« #2 : October 28, 2009, 04:36:32 PM »

The sub coating or "spider rust":

  • Is this a common problem on the 4 series?
  • What will happen if I decide not to remove it by sandblasting (or other methods)?
  • What prevents this happening again after a couple of years?

Jonathan Tee
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V8 because some say "2 heads are better than one"


« #3 : October 28, 2009, 05:07:15 PM »

  • I would guess it is if the original paint has not been cared for, regular polishes etc, and exposure to harsh conditions salts etc
  • in theory if the new paint traps it and prevents further oxidation nothing
  • the use of good quality paint, the does not become porous with age, and regular care and maintenance

Pierre Bester
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« #4 : November 02, 2009, 10:14:22 AM »

What about rust in the areas that sandblasting cannot get to ie: blind sections in the chassis frame? If you can't remove it all, why do it in the first place? :-\

Theo Marx
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« #5 : November 02, 2009, 12:52:01 PM »

That is why you galv the chassis  ;D

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Pierre Bester
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« #6 : November 02, 2009, 02:58:42 PM »

Yes Theo, but to galv over rust??? How long before it comes off? :o

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« #7 : November 02, 2009, 07:30:46 PM »

Not over it ! You blast , acid dip and then galv ;)

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Trevor Roux
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« #8 : November 18, 2009, 03:27:17 PM »

Pierre havent you got a nice friend in Paarl by the name of Jaco that can help you with this ;D

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Keith Richardson
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40's Rule


« #9 : November 18, 2009, 06:22:11 PM »

Sandblast is best - f@ck the rest

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« #10 : November 26, 2009, 08:39:42 PM »

Sand blast got me to battle getting the one plug into J.T's transfer case
So, its where you do it that counts.

Jonathan Tee
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V8 because some say "2 heads are better than one"


« #11 : November 27, 2009, 07:37:25 AM »

Ja ja, but lucky for me you are an old dog, and you know all the tricks  :drinks:

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