Compatibilty of slide rings sealants with immersion oil

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Hobbyst46
Posts: 3018
Joined: Mon Aug 21, 2017 9:02 pm

Compatibilty of slide rings sealants with immersion oil

#1 Post by Hobbyst46 » Tue Nov 17, 2020 10:15 am

This is about ringing with a single sealant, that serves for sealing, protection of the resin layer from humidity and alcohols and immersion oil, and provides am esthetic appearance as much as practicable.

As described in a previous post, ringing slides with nail polish (NP) by means of the DIY ("short-term rotation") ringing table worked for me. It is equally convenient for other lacquers and paints.

However, I was annoyed to find that the NP rings were not compatible with immersion oil. Namely, immersion oil, upon long-term contact (say, an hour) with the ring dissolved it and caused swelling. Is this a new finding ??? this happened even when the oil drop was laid on the ring several days after ringing; the NP layer must have been dry for all practical purposes.

Naturally, the specific NP brand was suspected. So I tried it with three other brands as well, and got the same result more or less.
An extensive test is planned, on as many brands of NP that I can gather around.

A shellac ring was destroyed by the oil.
Model paints, Revell and Humbrol, also failed upon several hours exposure to immersion oil.

So I tried Hammerite, a "direct on rust" white oil-based paint. Placed an oil drop on it two days after ringing. So far, an exposure of 10 hours did not harm the ring.
Note: I am using Cargille immersion oil type A, bought less than a year ago.
Zeiss Standard GFL+Canon EOS-M10, Olympus VMZ stereo

MicroBob
Posts: 2244
Joined: Sun Dec 25, 2016 9:11 am
Location: Northern Germany

Re: Compatibilty of slide rings sealants with immersion oil

#2 Post by MicroBob » Tue Nov 17, 2020 4:22 pm

Hi Doron,
the german Wikipedia is quite imformative on nail polish: https://de.wikipedia.org/wiki/Nagellack

Apparently this is/used to be nitrocellulose dissolved in butylacetate or etylacetate. When you buy the most old fahioned nail polish this is probably what you get. And this might give you a starting point for a search for resistances against solventy. Classic nail polish remover contained a lot of acetone but today this is not so widely used anymore.

Here in germany the likelyhood to get a classic solvent based paint is best when you look for paints sold for use by professionals. I'm quite sure that you could learn something when you would visit a nail studio in a less busy moment. Since this might be quite funny too: Please don't forget to report here!

I learned about UV cements from a femal apprentice who shoved her hands in my face and said: "See - I did these myself!".

Bob

Greg Howald
Posts: 224
Joined: Tue Oct 20, 2020 6:44 am

Re: Compatibilty of slide rings sealants with immersion oil

#3 Post by Greg Howald » Tue Nov 17, 2020 6:58 pm

Maybe it is the oil. I have had success with mineral oil, (R. I. 1.46) or maybe try making a ring with, of all things, polyurethane. Shellac will not hold up. I've tried that under various conditions without success. I had some inexpensive prepared slides that were fine until I used cedar oil for immersion. In no time the cover glass came off and the slide was destroyed. I put all of them in the trash.
Greg

Hobbyst46
Posts: 3018
Joined: Mon Aug 21, 2017 9:02 pm

Re: Compatibilty of slide rings sealants with immersion oil

#4 Post by Hobbyst46 » Tue Nov 17, 2020 7:20 pm

Greg Howald wrote:
Tue Nov 17, 2020 6:58 pm
Maybe it is the oil. I have had success with mineral oil, (R. I. 1.46) or maybe try making a ring with, of all things, polyurethane. Shellac will not hold up. I've tried that under various conditions without success. I had some inexpensive prepared slides that were fine until I used cedar oil for immersion. In no time the cover glass came off and the slide was destroyed. I put all of them in the trash.
Greg
I think I can overcoat NP-sealed slides with the Hammerite. Those are collected, cleaned and processed diatoms, trash is the last option.
Zeiss Standard GFL+Canon EOS-M10, Olympus VMZ stereo

Greg Howald
Posts: 224
Joined: Tue Oct 20, 2020 6:44 am

Re: Compatibilty of slide rings sealants with immersion oil

#5 Post by Greg Howald » Tue Nov 17, 2020 8:45 pm

I thank you for that solution. Greg

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