Paraloid B-72

zdw 2 hours ago | parent | next [-]

This is the most esoteric post I've seen on HN in a while.

How many museum curators who need non-yellowing flexible thermoplastic are there on here?

Oil painter here, this is news to me and if it doesn't dissolve in gamsol this is EXACTLY what I've been looking for for about 2 years.

	▲	card_zero an hour ago \| parent [-]
		I followed the link to flexographic ink, and now I'm wondering whether boutique fine art flexography could or should exist. Like lithography, but more plastic.

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kazin1870 2 hours ago | parent | prev | next [-]

I use paraloid all the time, a bit surprised to see it posted here but I’ll support it.

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boppo1 2 hours ago | parent [-]

I'm new to it and having trouble finding guides:

- how do I apply it as a coating? I want it to be ~ 1/6" to 1/8" thick and as hard as possible

- will turpentine dissolve or soften it?

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chromacity an hour ago | parent | next [-]

It's a relatively soft plastic and I don't think you can realistically build a uniform, good-looking layer that's 1/8" thick, if that's what you mean. If you need that thickness, high hardness, and nice appearance, I think your best bet is just a sheet of glass or acrylic on top.

It can be used as protective varnish, but that would be a very thin layer, probably 0.1 mm or something like that.

	▲	boppo1 an hour ago \| parent [-]
		Does it not level from gravity like other resins?

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halestock an hour ago | parent | prev [-]

I found a couple:

https://resources.culturalheritage.org/osg-postprints/wp-con...

https://www.zoicpaleotech.com/pages/paraloid-b72-in-fossil-p...

acetone will dissolve it, dunno about turpentine.

	▲	boppo1 an hour ago \| parent [-]
		I'm reading that turp does not dissolve it, which is ideal so I can mix paint on top of it.

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CarVac an hour ago | parent | prev | next [-]

I've done some DIY piano maintenance and I saw what was presumably this available to firm up the hammers. My piano needs them softened, though.

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colordrops 2 hours ago | parent | prev [-]

They should make non-yellowing transparent phone cases out of this stuff.

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Xmd5a 12 minutes ago | parent | prev | next [-]

Could this be used to 3D print supports ? For now, the only thermoplastic I know of that can be used to this effect is HIPS in conjunction with d-limonene.

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CarVac an hour ago | parent | prev | next [-]

Heh, I upvoted this a few days ago and it must've gotten on the second-chance queue.

Links to obsure but interesting Wikipedia articles are some of my favorite HN posts.

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aidenn0 an hour ago | parent | prev | next [-]

How does its strength compare to MMA structural adhesives? What materials is it compatible with?

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0xbadcafebee 2 hours ago | parent | prev | next [-]

Huh. So it's a stronger, harder, less brittle, clear wood glue you can dissolve with acetone. Neat!

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FpUser 2 hours ago | parent | prev [-]

Am I the only one that read it as Polaroid ;) ?

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UncleOxidant 2 hours ago | parent [-]

No,you are not. I was expecting it to be a camera.

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zephen 2 hours ago | parent [-]

I thought it was a cross between a camera and a bomber.

	▲	NDlurker an hour ago \| parent [-]
		Edwin Land, the inventor of the Polaroid, worked on the U2's camera. https://otislibrarynorwich.org/2024/04/08/edwin-land-and-the... https://www.smithsonianmag.com/innovation/polaroid-inventor-...