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Thoughts, and I am aware of it's toxicity, PPE requirements etc.

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.

Lots of folks are using it. Some of the top builders use it.

I highly recommend buying access to the Jeff Jewitt course on catalyzed urethane finish application, available on Robbie O’Brien’s website. It’s really informative.

Jeff Jewitt tends to post snippets of his process or progress shots from which useful info can be gleaned on his social media accounts too. Worth a look and the guy has probably forgotten more about wood coatings in general than many of us of will learn in a lifetime.


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What's '2k'?

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Peter Havriluk

Shorthand for “2 component”. A chemical reaction between the two components results usually in additional hardening as it cures, or some other desired characteristic.

I've posted about using 2k urethane here --- search for old threads. Not everyone has the same goals, client-base, expectations, etc ... So what works for me may not be ideal for you. Here's a link to my website where I explain "why" I chose urethane over the other available options.

http://fayguitars.com/Guitars/finish.html