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Magister varnish oil resin ratio


Davide Sora
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8 hours ago, Michael_Molnar said:

I have been using Mirlon Total UltraFine. I follow up with a horsehair (shoeshine) brush to buff away any dust. I understand that it can be used wet. Anyhow, I like using it dry and recommend it. 
 

BTW, steel wool always left iron particles behind for me that showed up later as it oxidized. Nothing like that with Mirlon.

Thanks for this tip, Davide. ;)

You're welcome:)

I use it for varnish, I have never tried it for wood finishing but I know some colleagues use it also for wood. If you like to try a finer grain Shinex works well too, a bit less aggressive than Mirlon : https://www.cremonatools.com/shinex-sanding-sheets.html

 

6 hours ago, uncle duke said:

Equal to 1500 wet or dry?

It is difficult to make comparisons because the behavior is a little different, and these "wool pads" tend to become less aggressive after a short use, while Micromesh type sandpaper retains the nominal grit longer. Anyway, the Mirlon 2500 in my opinion is similar to the 2400 Micromesh while the Shinex 3000 is comparable to the Micromesh 3200. I have no experience with coarser grains, although for wood finishes they could be interesting, but I fear that if you overdone the sanding you will get a result too similar to that of traditional sandpaper (loss of straightness and sharpness of medullary rays) which I would like to avoid, for this reason I've never tried it directly on wood.

https://www.cremonatools.com/mirlonr.html

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The traditional wisdom in varnish texts makes a differentiation in oil to resin ratios.

1:1 and leaner are considered polishing varnishes.

Above 1:1 are considered brushing varnishes.  That us that they have their best surface off the brush.

on we go,

Joe

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On 7/28/2021 at 11:45 AM, joerobson said:

The traditional wisdom in varnish texts makes a differentiation in oil to resin ratios.

1:1 and leaner are considered polishing varnishes.

Above 1:1 are considered brushing varnishes.  That us that they have their best surface off the brush.

on we go,

Joe

And what is said about other ratios? 

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51 minutes ago, Michael_Molnar said:

And what is said about other ratios? 

The more oil, given the same resin, the more durable the varnish.  Flooring varnishes run between 3:1 and 5:1 oil to resin.  Marine varnish is more oil yet. 

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37 minutes ago, Michael_Molnar said:

Can anything be said about how the oil content of a varnish affects tone?

This question is not for Joe Robson unless he does have something to share.

 

I try to stick to what I know!!

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