Scratches that just won't rub out.

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Originally Posted by soundman

this is a flaw that has to be addressed with some sort of thinned resin......

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Not 'has to', there are alternatives. As mentioned, the CA worked fine. It has the advantage over most things that it wicks into cracks and coats the whole surface, plus has good bonding strength to help ensure that the crack doesn't continue. This was for under a wipe-on poly finish, and the cracks are completely invisible now.
It was naturally dried timber. I haven't struck any other cracking, just this one which extends a long way into the block - I traced and marked it for the future.

CA is a resin.

cheers

Quote:

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Originally Posted by soundman

CA is a resin.

cheers

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Nope. Resins are produced by plants or trees . Cyano-acrylates aren't.

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Originally Posted by Hermit

Nope. Resins are produced by plants or trees . Cyano-acrylates aren't.

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CA is a resin. Resins may be synthetic or natural products from not only plants, but insects too, and possibly higher animals* as well. The name can really be applied to any organic molecules or mixtures that set to a solid and that might be through a chemical change or just solidifying.

*Ambergris come to mind

Quote:

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Originally Posted by mic-d

CA is a resin. Resins may be synthetic or natural products from not only plants, but insects too, and possibly higher animals* as well. The name can really be applied to any organic molecules or mixtures that set to a solid and that might be through a chemical change or just solidifying.

*Ambergris come to mind

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If that's the case, I stand corrected. (Not just trying to start arguments.)
However, I did look it up in the (online) dictionary and it only mentioned plants or trees. Not even animals, so according to it not even shellac is a resin.

Digging further now.
You are both correct.:-

Just found this: -
2. Any of numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials such as polyvinyl, polystyrene, and polyethylene and thermosetting materials such as polyesters, epoxies, and silicones that are used with fillers, stabilizers, pigments, and other components to form plastics.

and:

cyanoacrylate is an acrylic resin


We learn something every day.:D

(I guess resin used to come from only plants or trees - 100 years ago.:;)
Humble pie for lunch.

The point being, such fine cracks and splits are better dealt with filling with resins ( liquid products that set to solids, if you like) prefereably fine, runny ones, rather than particulate fillers.

cheers

Quote:

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Originally Posted by soundman

The point being, such fine cracks and splits are better dealt with filling with resins ( liquid products that set to solids, if you like) prefereably fine, runny ones, rather than particulate fillers.

cheers

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Can't argue with that. We're coming from the same place. I use liquid for fine cracks and 'particulate', (epoxy or PVA + sawdust), for gap filling.

(I thought you originally meant that CA wasn't suitable and that I should have used shellac or similar.)

Yeh the PVA does not work well with sawdust or for other gap filling or sealing, mostly because it does not go off hard and does not penetrate.

It is a relativly soft elastic product when cured and does not sand well, nore does it hold finish well.

Far better of looking at the resinous type products.

Hide glue goes off crisper and works reasonable well, shelac works a treat, the harder epoxies work well, the softer ones (like retail araldite)work poorly....CA can work well but its expensive and goes off a but fast for bogging up holes..althoug packing the void with the particles and then applying the CA can work.

Heaps of people keep pushing the PVA and sawdust, both on TV and books...but it works very pooly compared to other things available.

cheers