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PostPosted: Thu Jan 10, 2019 2:52 pm 
356 Fan

Joined: Wed Aug 15, 2018 1:55 pm
Posts: 31
I can see that if you chemically dip a body any internal areas, box sections, where folds meet could give later problems.

If you then dip etch prime will this not give the long term protection desired.

Those same box sections can not be media blasted and surly will corrode anyway.

This subject evokes strong opinions.

Experience seems to be the only way of knowing.

Whats your experience.

Many Thanks

David


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PostPosted: Thu Jan 10, 2019 3:43 pm 
356 Fan

Joined: Thu Apr 01, 2010 4:35 pm
Posts: 933
David Austin wrote:
I can see that if you chemically dip a body any internal areas, box sections, where folds meet could give later problems.

If you then dip etch prime will this not give the long term protection desired.

Those same box sections can not be media blasted and surly will corrode anyway.

This subject evokes strong opinions.

Experience seems to be the only way of knowing.

Whats your experience.

Many Thanks

David


Wonder if chemical dip will get in between the plethora of rusty lap welds?
I imagine the only way to get rid of every speck of rust on a 356 would be to completely dismantle it, including break all the spot welds, physically remove the rust, seal and then reassemble.

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Last edited by Dan Epperly on Fri Jan 11, 2019 8:16 pm, edited 1 time in total.

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PostPosted: Fri Jan 11, 2019 2:48 am 
356 Fan
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Joined: Tue Jul 01, 2008 3:06 pm
Posts: 111
Location: Vantaa, Finland
Anybody tried these guys?
http://www.surfaceprocessing.co.uk/
Look very good.

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KTF,

Juha Vane
Finland

'59 308
'63 356
'85 911


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PostPosted: Fri Jan 11, 2019 11:24 am 
356 Fan

Joined: Sun Mar 30, 2008 4:24 pm
Posts: 28
Location: Keystone Heights, FL, USA
I have done cars both ways. I have had 3 cars dipped, and 3 media blasted. In the end I think chemical dip is best, but there are decision points when deciding which way to go.

How badly rusted is the car? It's always worse than you think, sometimes much worse. If you are unsure, or if the car is going to stay in your family for a long time, then I would chemically dip. If the car does not appear to be overly rusty, or have excessive accident damage, then media blasting may be the way to go.

Cost may be a factor. In central Florida, to media blast a car costs me $800-1000. Chemical dip is around $2500.

Chemical dip will show where rust was in areas you did not expect, resulting in more repair/replacement of body work. You get back a huge piece of swiss cheese from the dip. But at least you can be confident the rust is gone.

In the past I have read where some have experienced "bleed" at seams with chemical dipping. This probably depends on the dipper. If properly neutralized and primed, this does not seem to be a problem. I have not seen this, but I only have about 15 years experience.

My body man complains either way. With dipping, he has to quickly prime everything. With media blast he complains of the dust.

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Bob Bates
54 Speedster
65 356SC
71 911T
73 911S
73.5 911T
2003 996 Turbo


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PostPosted: Fri Jan 11, 2019 11:51 am 
356 Fan
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Joined: Tue Jul 01, 2008 3:06 pm
Posts: 111
Location: Vantaa, Finland
We’re doing here high pressure water blasting. Won’t deform the sheet metal,
but all paint, rust etc. is gone. But this don’t go to seams and other hidden areas.

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Juha Vane
Finland

'59 308
'63 356
'85 911


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PostPosted: Fri Jan 11, 2019 6:40 pm 
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Joined: Tue Apr 15, 2008 4:37 pm
Posts: 4059
Location: SW Los Angeles
Robert, thanks for the info. It seems both have their pros and cons including price differential.

Mike

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Lomita, CA
'63 B coupe


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PostPosted: Sat Jan 12, 2019 5:59 pm 
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Joined: Tue May 06, 2008 3:47 pm
Posts: 2440
Location: Orange Co., CA
I've tried all of them, I'm back to removing by hand. One needs to be careful not to remove too much metal. …………………...Jim.

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