BS: UV curing glue - any advice ?

Subject: BS: UV curing glue - any advice ?
From: Mr Red
Date: 18 Jul 17 - 06:26 AM

this sort of thing

I can see a couple of small repairs/inventive mods that would benefit from a glue that can be applied, with copious amounts of time to set up and curing in seconds to rock hard. The specs arm I broke ie.
And if it is a gap filling glue it might serve as the lug (say) that is needed. And maybe if it can be semi hard and carved then fully set - wow! Maybe built up in two goes.

I am assuming it is not hygroscopic like super glue, would I be right?

Advice please. TIA

Subject: RE: BS: UV curing glue - any advice ?
From: Jack Campin
Date: 18 Jul 17 - 06:49 AM

It's been used by dentists for something like 30 years.

Subject: RE: BS: UV curing glue - any advice ?
From: gillymor
Date: 18 Jul 17 - 08:10 AM

I use it for both fresh and saltwater fly tying in head and body building. IMO (and in the opinion of all the tiers I know) it's easier and safer to use than epoxy and yields a better finished product.

As for use in household repairs bear in mind that all the substance has to be exposed to UV in order to cure. I use Loon Clear Fly finish which comes in several consistencies but the thickest one suits my purposes. UV flashlights can be expensive but I got one from Amazon for 6-7 bucks and it seems to work just fine though I hear some of the more expensive ones give a faster cure. Unless I'm in a hurry I give my flies a quick exposure to the light and them set then out in the sunshine for an hour or so which makes them very hard.

Loon resin seems to leave a slightly tacky residue but that can be removed with a quick wipe of isopropyl alcohol after your work is fully cured.

One more tip: When ready to cure hit your project with 5 seconds of UV and let it set for 15 seconds before final cure which takes 30-40 seconds depending on the amount of product you've used.

Subject: RE: BS: UV curing glue - any advice ?
From: gillymor
Date: 18 Jul 17 - 08:31 AM

and regarding hygroscopic qualities my flies are exposed to high humidity and immersion in saltwater down here in Florida but the UV resin parts of the fly just go on forever.

Subject: RE: BS: UV curing glue - any advice ?
From: Mr Red
Date: 18 Jul 17 - 08:44 AM

dentists can't cure my teeth (those that are left)

I was not aware they used clear resin, never having eyes on stalks, I guess they use translucent filler, because the UV bursts (several) are longer than 5 seconds in my estimation. Different resin compound is my guess.
Maybe if there is a residue left it is a carrier fluid of some sort, I will be leaving the stuff in the sunlight eventually
The dispenser in the link has an LED at one end and a nozzle protected by a UV filter black cap.

All observations welcome TIA

Subject: RE: BS: UV curing glue - any advice ?
From: gillymor
Date: 18 Jul 17 - 09:29 AM

I didn't notice the original link and am unfamiliar with that type of delivery system but at that price it's probably worth experimenting with.

Subject: RE: BS: UV curing glue - any advice ?
From: Donuel
Date: 18 Jul 17 - 11:54 AM

I have used it often and it will not give you semi hard workable time you can rely upon.

It can be sanded and carved.

Some types only need bright white light. UV has some advantages.

It does gaps well. A thickness must be retained for extra strength.
So layering may be called for like projects to repair stems of glasses.

There are sites that carry all types and colors.

Budget glue kits do not go very far but it can last for 3 or 4 small projects.

The dry repair has an approximate consistency.hardness of poly carbonate

Subject: RE: BS: UV curing glue - any advice ?
From: Rapparee
Date: 18 Jul 17 - 11:16 PM

Probably shouldn't repair a tanning bed with it, huh?

Subject: RE: BS: UV curing glue - any advice ?
From: Stilly River Sage
Date: 18 Jul 17 - 11:46 PM

As was remarked above, dentists have been using this process successfully for quite a few years. I have several fillings and half-crowns that attest to that.

Subject: RE: BS: UV curing glue - any advice ?
From: Joe Offer
Date: 19 Jul 17 - 12:10 AM

How thin must the glue be to cure? I haven't been having much luck with Gorilla Glue on my chair legs. I have a large, tall, 27-yr-old male living in the house. Somehow, he can't seem to avoid tipping back in chairs. Gluing chair legs is a constant battle here.

Subject: RE: BS: UV curing glue - any advice ?
From: Mr Red
Date: 19 Jul 17 - 05:54 AM

Methinks you need a bit of mechanical engineering design Joe. Like struts/cross-bracing where the tipped-back chair and posterior are aiming for. Add wood IMNSHO.

Colours you say? Is red available? Red does absorb all wavelengths except red. But it must be somewhat translucent for the UV to penetrate.

I must have! Er - maybe not at this price Dymax Ultr-Red 3113-UR

Subject: RE: BS: UV curing glue - any advice ?
From: Greg F.
Date: 19 Jul 17 - 09:03 AM

I haven't been having much luck with Gorilla Glue on my chair legs.

That's because you're using the wrong glue and the wrong technique-just glopping glue on there won't work. Pick up a good book on furniture repair/restoration and learn how to do it right.

Subject: RE: BS: UV curing glue - any advice ?
From: Jon Freeman
Date: 19 Jul 17 - 09:21 AM

I think a semi yes there from me Joe. If you (unlike me) had the proper jointing skills, a look that way would be worthwhile. Beyond that, maybe a wood screw of suitable size???

Subject: RE: BS: UV curing glue - any advice ?
From: gillymor
Date: 19 Jul 17 - 09:26 AM

If the chair is wood use an aliphatic resin (Titebond or Elmer's Wood glue which you can get at Home Depot) and clamp the repair in place for 24 hours. If the dowel end of the chair leg does not fit snuggly in the hole any more you'll have to fill it with a glued-in dowel and rebore it. This is the way I've always reattached wooden chair legs and it's always worked.

Subject: RE: BS: UV curing glue - any advice ?
From: gillymor
Date: 19 Jul 17 - 09:35 AM

and a UV cure glue needs to be exposed to UV light in order to cure so it would probably not suit your purpose.

Subject: RE: BS: UV curing glue - any advice ?
From: Greg F.
Date: 19 Jul 17 - 09:40 AM

Beyond that, maybe a wood screw of suitable size???

REALLY bad idea. That'll only make things worse.

Subject: RE: BS: UV curing glue - any advice ?
From: Mr Red
Date: 19 Jul 17 - 10:44 AM

modified design.
The only way to go when the item is being used in a way it was not designed to be used.
call me an engineer but I say: Horses for courses.

Subject: RE: BS: UV curing glue - any advice ?
From: Mr Red
Date: 03 Oct 17 - 11:07 AM

I ordered some glue on E-Bay from China - waited - complained, got the refund. Re-ordered from UK and tried it straight away on two spectacle arms that had broken in the same place (separate instance). The repair looks OK but are sitting in the window for the 24 cure and to get more UV, they should ideally be outside without glass attenuating the UV, but...
There is no hurry - I bought a pair from Germany (the only place I could) and transferred the red arms. Mine were a monochromatic amalgam to order, including lenses.
Now I have back-up, dancing is not a non-contact sport!

Subject: RE: BS: UV curing glue - any advice ?
From: EBarnacle
Date: 04 Oct 17 - 06:21 PM

Joe, in addition to the correct glue, it appears as though you have at least one loose fitting. Consider making a cut along the grain with a fine saw and inserting a shim part way. Add the glue to the joint and, if you have done things properly and, when you gently force the parts back together [Yes, I know it seems contradictory] you should have a snug fit reinforced with glue. The shim will force the end of the brace against the sides of the hole. If you have questions PM me.