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Post subject: Re: Fender MIM 70s reissue paint cracking
Posted: Tue Sep 17, 2013 1:32 am
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Joined: Thu Jul 30, 2009 11:47 pm
Posts: 17
Quote: "The neck pocket, by the way, is ALWAYS a stress point for finishes"


It's for sure that I always pick up any type of ash or heavier bodied Guitar or Bass by its body or both horns when removing it and replacing it into its case etc.

I always try to avoid like the plague the ergonomically natural thing to do, pick it up by its neck. This is guaranteed to place greatest stress upon the neck pocket area, resulting in this problem.

Considering I have some extremely heavy Guitars and Basses, perhaps some of the heaviest ever manufactured, yet have entirely avoided any such incidence of this problem over many, many decades, I believe the problem is an avoidable one, but requires consciousness of the potential for damage, a best practise procedure, and avoiding allowing "friends" to handle the Instrument willy nilly.



In my opinion, it is a caused by a very marginal, slightly increased build up of material where finish has been applied to the inside of the top horn, the inside of the bottom horn, The top face and bottom face and around the neck pocket where the fitting of a slave ensures it is manhandled during spraying and is an obstruction to be sprayed around, a common "gravity magnet", and is likely to ensure something of a slight build up of material at that point where coats from many differing directions converge.

Thicker than normal material + stress point + the top horn to neck pocket could encounter additional stress from straps by virtue of the manner in which certain performers behave on stage.

This combination accounts for the problem from a user perspective. In my opinion it is stress induced at a point highly susceptible to material build up.




Here is what causes cracking problem from a Manufacturing, Factory Facility and Material Supplier perspective.




Origin and Potential Causes:

Excessive film thickness.

Excessively thick topcoats magnify normal stresses and strains which can result in cracking even under normal conditions.

Materials not uniformly mixed.

Insufficient flash times between coats.

Incorrect use of additives.

Substrate is too hot or cold.

Use of coats incompatible with each other.

Omitting the activator when mixing a 2K product.





Prevention Techniques:

Don't pile on topcoats.

Allow sufficient flash and drying time between coats.

Do not dry by fanning with compressed air from the spray gun.

Stir all pigmented undercoats and topcoats thoroughly.

Read and carefully follow recommendations in the Technical Data Sheet(s).

Additives not specifically designed for a color coat may weaken the final paint film and make it more sensitive to cracking.


Remedy

The affected areas must be sanded to a smooth finish, or in extreme cases removed down to the bare material, and a full refinish system reapplied.





It is a manufacturing issue, but one which is far more likely to occur to certain individuals by virtue of the manner in which they handle their Instruments.

Obviously, if there is a thick build up of material, the instrument is quickly exposed to strong changes in temperature and humidity gigging, where the wood and finish are expanding and contracting at varying rates, and stress is placed at those points, then this would create ideal conditions for the occurrence of such a problem.

I normally have between 2 - 6 Paint Reps from different Top Paint Companies on hand all the time, along with a Laboratory manned by specialists with Doctorates in this Field. They are looking at Paint issues with powerful microscopes for analysis.


Hope this helps!



P


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Post subject: Re: Fender MIM 70s reissue paint cracking
Posted: Tue Sep 17, 2013 6:25 am
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Professional Musician
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Joined: Sun Jun 28, 2009 6:57 pm
Posts: 1868
Location: Kansas City Mo
I have owned 4 made in USA Stratocasters in my life, all for long periods of time.
I have routed them, dropped them out of straps, gig with them, piled them in the backs of vans and knocked them over off of stands.
They have never done what these in the pictures are doing.
I know its a common issue with lots of Mexican strats as it has happened right in front of me more than once.
Good luck with those.

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Post subject: Re: Fender MIM 70s reissue paint cracking
Posted: Tue Sep 17, 2013 8:15 am
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Aspiring Musician
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Joined: Sat Jul 07, 2012 7:27 am
Posts: 351
Location: From the Gaul
Right, my Classic 50s is covered with a shell that will soon force me to strip it! :cry:
But on a MiM, it is not a sacrilege! :wink:

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