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Paint "Stripper" (NOT)
#1
I am restoring my '73 Tang and the radiator fan needs to be stripped and repainted.
I bought "Aircraft Stripper" (which says in the fine print not to use on airplanes) and applied as directed.  Results: Negative.
I heated the part: Negative.    Used sand paper to remove surface paint:  Negative   Used M.E.K. to remove surface barriers;  Negative.
Wrapped stripper and fan in paper towel : No   Wrapped in Aluminium foil;  No

As you can see it still has very little effect.
Sanding to base metal is not really an option.
[Image: SAM_0335.jpg]

tiny image hosting


Any Ideas?

According to this "Stripper" is is supposed to buckle the old paint and then I scrape it off.   No Way

Ugh !!!

Roy
  Reply
#2
(12-28-2017, 04:07 PM)Helicopter Wrote: I am restoring my '73 Tang and the radiator fan needs to be stripped and repainted.
I bought "Aircraft Stripper" (which says in the fine print not to use on airplanes) and applied as directed.  Results: Negative.
I heated the part: Negative.    Used sand paper to remove surface paint:  Negative   Used M.E.K. to remove surface barriers;  Negative.
Wrapped stripper and fan in paper towel : No   Wrapped in Aluminium foil;  No

As you can see it still has very little effect.
Sanding to base metal is not really an option.
[Image: SAM_0335.jpg]

tiny image hosting


Any Ideas?

According to this "Stripper" is is supposed to buckle the old paint and then I scrape it off.   No Way

Ugh !!!

Roy
I don't know Roy ...there are things I strip and things I have sandblasted.    FANS are something I have sandblasted as you will never get the jelled up paint off all the rivets and seams IMO.

In using aircraft striper I've found you have to apply many coats AND be removing BEFORE the last coat dries too much.   It works on certain paints on certain surfaces great ...not so much on others.

Mark
P.S.  I wouldn't be suprised if FANS were painted and baked!
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#3
Is it possible that someone powdercoated your fan?
  Reply
#4
powder coating would hold like that, but blast that thing, any good paint shop can do it for you. less its powder coated then polish it and call it good.
  Reply
#5
That sounds like powder coating.

Personally I have had good luck with the POR15 brand gel stripper. Other thing that works if it is rusty is washing soda electrolite with a DC power supply.

Some Powdercoaters will have a chemical bath that will strip powder coating and most anything else. Might be worth your time to call around.
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#6
OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.
BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!
If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.
If you must repaint it get it professionally chemically dipped if home solutions don't work.

EDIT NOTE: While in the shower, it came to me that the flex fan blades were NOT painted at all, just the spider. Thinking back 40 years is getting tougher by the day!!
I would have think that the fan Helicopter has, HAS been repainted, but the above applies. I've not heard back from my engineer buddy who, while not working in the FAN department, has better knowledge of the production methods. I'll update when I hear form him.
  Reply
#7
(12-29-2017, 09:25 AM)Stanglover Wrote: OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.
BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!
If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.
If you must repaint it get it professionally chemically dipped if home solutions don't work.

Is the typical 73 fan one of these "flex fans" ?  Can I tell by just looking at it ? I never even gave any thought to this being a liability.

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
  Reply
#8
(12-29-2017, 09:41 AM)mudbilly Wrote:
(12-29-2017, 09:25 AM)Stanglover Wrote: OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.
BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!
If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.
If you must repaint it get it professionally chemically dipped if home solutions don't work.

Is the typical 73 fan one of these "flex fans" ?  Can I tell by just looking at it ? I never even gave any thought to this being a liability.

 I'm not sure what years they were on mustangs, but possibly. The fan Helicopter is showing is a 5 blade flex fan. It has flexible blade riveted on to the "spider" as can be seem.
I'm amending my above post.
  Reply
#9
(12-29-2017, 09:25 AM)Stanglover Wrote: OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.
BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!
If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.
If you must repaint it get it professionally chemically dipped if home solutions don't work.

EDIT NOTE: While in the shower, it came to me that the flex fan blades were NOT painted at all, just the spider. Thinking back 40 years is getting tougher by the day!!
I would have think that the fan Helicopter has, HAS been repainted, but the above applies. I've not heard back from my engineer buddy who, while not working in the FAN department, has better knowledge of the production methods. I'll update when I hear form him.

Excellent !!!    You know your stuff.   Yes, maybe I should consider a '71 fan.  TNX
  Reply
#10
Helicopter, hope you had a Merry Christmas and look forward to a safe Happy New Year and another great year here!
I'm going to post a link to a thread from August where we discussed the flex fans. Please read the entire thread. It contains a lot of info on the original numbers, the defective replacement numbers, and what replacements were safe to use. Unless your car is going to be a "Show Queen", I would even consider a fan/clutch set up which was also discussed. I would be concerned about doing much in the way of "Maintenance" on these flex fan blades. As Geoff stated the blades must be treated carefully so as not to alter their balance, the integrity of the blade material or the critical area where they attach to the hub. I'm presently out of town for the Christmas Holidays until January 3rd so I don't have access to any of my Ford reference material, but if you have any questions don't hesitate to ask. There are a lot of knowledgeable folks here.  
https://www.7173mustangs.com/thread-corr...73-351c-4v

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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