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Diecast Forums - Forum 24 Diecast Zone

Posted By: Bruce Gibbins
Posted On: Monday March 11, 2019 at 7:03 AM
 
Message:
I agree with Phil - your model has paint rash, Chav.
Here is an explanation for both I posted earlier.
Most of this is from Wikipedia and my own experience.
Here goes:
Not to be confused with zamac pox or cancer, is paint rash - caused by surface contamination of the model being painted - being poorly prepared for painting. These flaws can often be corrected by a re-paint.

What is far worse is the mess that reveals its self as a condition of degradation of the metal used to cast the model.
Here is a description copied from a wikipedia entry
"The metal used in die-casting is commonly, Zamak (called Mazak in the UK), an alloy of zinc with small quantities of aluminium and copper. Lead or iron are impurities that must be carefully avoided in Zamac, as they give rise to a deterioration of the metal most commonly called zinc pest"

If you have a model in your collection afflicted in this way the tell tale signs are a softening of the metal that will allow hood and trunk lid hinges to break. Just like breaking the lead tip on a pencil. The worst effects reveal slithers, shards of metal start to separate and break the paint surface from beneath. Some models are well known for this to happen to them while others it's more random. I have two: both I bought knowing they had the Pox because I needed some of their parts and because of this they were very cheap.


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Message thread:

Q: Paint rash, cancer, "pox" - new to me ... let's clarify the terminology. by Chav Popov #54279
I would classify that as paint rash. Definitely not diecast “rot” or cancer /degradation (EOM) by Phil Realmuto #54279.1
I agree with Phil - your model has paint rash, Chav. by Bruce Gibbins #54279.2
Thx.. for posting that, Bruce. Very informative. (EOM) by Al Dorado #54279.2.1
I've had a couple cars i was able to improve the look by using a polishing compound (EOM) by Ron Dietrich #54279.3
Paint rash. Wet sanding with 2000 grit sandpaper and by Chang Lu #54279.4
PICS: This is "Die-cast rot or cancer". The car becomes worthless. by George Schire #54279.5
The kind of "rot" the '60 Tbird has is fortunately very rare, unlike the common paint rash by Chris Nickelsen #54279.5.1
My once beautiful '55 Pontiac has suffered the same fate as yours, George, and I have others as well (EOM) by Barry Levittan #54279.5.2
Yes, I understand that feeling George. Cancer is a rotten gig. (EOM) by Bruce Gibbins #54279.5.3
I have never had a problem with paint rash, maybe it is because by jay walsh #54279.6




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