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Dynax 7 - sticky back - any cure ?

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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Topic: Dynax 7 - sticky back - any cure ?
    Posted: 25 June 2012 at 14:08
I have tried a search here re the above problem but have not been successful. So has anyone come across this 'fault' with the Dynax 7 ? My attention was brought to it by a Dynax 7 for sale on the bay here in the UK this weekend. Listed as "faulty" and that was the only fault with the camera. Everything else was perfect and in working order. The seller said it was not a pleasure to use due to the stickiness of its back cover. It put me off bidding, and it went for L31.
I went and had a look at my Dynax 7, which is stored in its box. I have not used it for about 10 months. I found that there was some slight stickiness at the top left hand corner of the back.
Does anyone have any cure for this 'fault', and to prevent it developing further. One suggestion I have found is to use car interior cleaner, as it contains silicone, but to use it very sparingly.
I hope someone has an answer to this problem.
 



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Post Options Post Options   Quote revdocjim Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2012 at 14:27
Let me know if you find a solution! My 7 is very sticky too!
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2012 at 14:44
I've got one like that and haven't found a solution. It's annoying, but doesn't hurt the camera's preformance. Let us know if the silicone works.
I've been told that this is caused by storing the camera in a plastic bag, like a sandwich bag, etc, or even close to one. Something Minolta used in the coating reacts with the chemicals in the plastic. I used to store my gear in plastic bags with a dessicant packs to prevent fungus, etc, but I quit after this happened.
   
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2012 at 17:03
This is most likely a chemical reaction to skin oils or lotions from previous users. This surface is rubber-like coating and it comes of easily when it gets to that sticky stage. So be careful. This has been discussed here before as it is quite common. I used a little LPS-1 (probably not available in the UK) on mine and it helped a little. Your silicon solution might help. Use a cotton swab and apply a tiny bit to a small surface and wait. In any case this is mostly an annoyance more than a real problem. Let us know.

PS: In a previous post, a 7 user removed the stickiness with rubbing alcohol. However this also removed the rubber-like surface down to the shiny black plastic beneath.

Now might be a good time for the chemists amongst us to speak up!

Edited by AudioDoc - 25 June 2012 at 18:38
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Post Options Post Options   Quote mdenton Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2012 at 22:41
LPS-1 seems very similar to WD40,which is widely used in the UK.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2012 at 23:41
Originally posted by momech momech wrote:

I've been told that this is caused by storing the camera in a plastic bag, like a sandwich bag, etc, or even close to one. Something Minolta used in the coating reacts with the chemicals in the plastic. I used to store my gear in plastic bags with a dessicant packs to prevent fungus, etc, but I quit after this happened.
   


mine never been stored in a plastic bag , always in a regular camera bag or the pvc/leatherette case/bag that minolta sold for it , but it's still gone sticky anyway.

i've no idea why it's gone like this.

reckon i'll give a bit of wd40 on a rag a go and see how it goes.got some film in it at the moment though so will wait untill it's used up.


see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2012 at 23:45
3in1 (the oil firm) do a silicone based lubricant spray ,anyone any thoughts on that , rather than wd40?
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Post Options Post Options   Quote paulofessel Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2012 at 01:21
Originally posted by AudioDoc AudioDoc wrote:


PS: In a previous post, a 7 user removed the stickiness with rubbing alcohol. However this also removed the rubber-like surface down to the shiny black plastic beneath.


I've done exactly the same thing but I have no regrets about it, since the stickness is really unpleasant - principally in a country like mine, where tropical weather is the norm. And not having to think about the issue is a very good thing, since it will allow me to continue using the camera.
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2012 at 02:13
Originally posted by mdenton mdenton wrote:

LPS-1 seems very similar to WD40,which is widely used in the UK.


It is similar, thought not the same. LPS-1 is a petroleum based product. Don't know what's in WD-40, but according to their web site, there is no silicon in it. WD-40 is much more common here than LPS-1. As common as duct tape! The two multipurpose, must have, fix-all commodities! WD-40 is based in California. We use LPS-1 in the electronic service business for cleaning switches and controls, so it was readily available. I believe it may have, or be similar to naphtha, which is commonly used as a cleaner in camera repair. Again, any chemists here feel free to chime in!
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Post Options Post Options   Quote 4GibMe Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2012 at 03:48
Warning!!!

WD-40 has emulsifiers in it to help things break down, do not use it. It would in fact make things worse.

Putting a talcum powder or the like would create a barrier, but it will not stop or make it go away. Whatever you guys do, always do a small test.

Wish I knew what this was, or had access to one of these cameras.
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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2012 at 11:57
Thanks for all the replies and suggestions received so far. At the moment I will wait until someone comes up(hopefully) with the correct cure. I had thought about talcom powder or something similar. As I posted the 7 is just in its original box without being in a plastic bag.
I do have a Minolta 800si and a 600si in plastic bags with silica gel sachets inside, so I had better have a look at them. My Dynax 9 is in a cloth bag with silica, but I believe there is no rubberised finish to that model.
Anyhow, keep the possible cures coming.
Thanks.
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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2012 at 12:38
Just done a bit searching on Dyxum, and found my problem has cropped up in the past on the Dynxa 7 Club in here. However, from going through those posts it looks like no one has come up with a remedy. From what has already been mentioned, WD40 etc.,I think I will ignore those. Rather than talcum powder I may try a small amount of french chalk. If I do and the result is beneficial, I will let you know.
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2012 at 13:15
Thanks, Fred! Eager to hear the results. Its a very common problem and it would be nice to have a solution. Here another 7 with this issue: Minolta 7 with Sticky Back! Nice price btw.

Regards,

Kelly
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Post Options Post Options   Quote Bob Maddison Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2012 at 13:53
Don't use WD40 or any similar LUBRICANT spray. At best they leave a greasy / oily film, at worst they will make the problem infinitely worse.

Switch cleaning fluid (i.e. Servisol in the UK) is mostly a solvent but also leaves behind a thin film of lubricant which is great on switches but not on camera coverings!

A cloth moistened with Iso Propyl Alcohol might work, but beware of surgical spirit or "rubbing alcohol" as they often contain other chemicals that leave a film when the alcohol dries off. Another possibility is to try a cloth moistened with detergent then wash well with plain water.

Incidentally, talcum powder is the same as french chalk after it has been finely ground!

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