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M/Pieces - Ligs which JB Weld should I use to fill the bitemarks on my meyer?

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51
Hi, everyone. So i experimented with the blue putty & putting tape over my 7m because of the bitemark. It did not work. I've seen different JB weld products. Found out that some refacers use it to do baffle work and fix chipped mouthpieces. So my question is, which type of JB weld product is the appropriate one to use for filling in bitemarks on hard rubber mouthpieces?

I want to do this and put a clear mouthpiece patch over the area.
 

zelda

On the border
Messages
547
Locality
British Columbia interior, Canada
Hey, kiwm, This is a pretty slow time on the Café. It's early morning on the other side of the pond and they're all still abed I suspect. 9:08 here in British Columbia just a few miles above the Washington state border. I've noticed that the posts don't really get going until around midnight our time.

Sorry, I don't have an answer regarding the JB weld but I'm curious.
Jim
 

Ivan

Undecided
Café Supporter
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7,828
Locality
Peeblesshire
Hey, kiwm, This is a pretty slow time on the Café. It's early morning on the other side of the pond and they're all still abed I suspect. 9:08 here in British Columbia just a few miles above the Washington state border. I've noticed that the posts don't really get going until around midnight our time.

Sorry, I don't have an answer regarding the JB weld but I'm curious.
Jim
Morning All
 

kevgermany

ex Landrover Nut
Café Supporter
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21,912
Locality
Just north of Munich
Morning, bet you lot are all in bed.

You need to use something guaranteed non toxic. This rules out epoxies not specifically rated for food/water contact use. Waterweld will do it, but it's white. Dental acrylic should also work.
 

zelda

On the border
Messages
547
Locality
British Columbia interior, Canada
OP may be. I'm close to the left coast, well, a day's drive. It's only 10:52 here but I'm off to bed. G'night.
Waterweld, eh? Thanks.
 

jonf

Well-Known Member
Messages
3,743
Locality
Betelgeuse
Waterweld's definitely the one. It's the only one rated by the FDA for use in drinking water environments. Looks a bit odd but works very well.

If you use dental epoxy make sure you get the right stuff. Some that's sold is intended for travellers to use as a temporary repair if a tooth is cracks a long way from home. As a result, it is specifically intended to be easy to remove, and is therefore soft. You need permanent dentist's epoxy, which is quite hard to find.
 

Ivan

Undecided
Café Supporter
Messages
7,828
Locality
Peeblesshire
There's probably a recipe online for dental amalgam

Now where's that vial of mercury?

Word of the day: triturate
 

altissimo

Well-Known Member
Messages
3,349
Locality
leicester
the term 'epoxy resin' covers a variety of different formulas, in most cases it's the hardener that will be more noxious and cause the most concern. When properly cured, the hardener and resin will have formed a cross linked polymer which isn't toxic - it's not uncommon in chemistry for two harmful chemicals to react together and form a safe one. The safety warnings on manufacturers data sheets refer to the resin and hardener before they've reacted together and I suspect that a lot of the panic regarding using epoxy to repair mouthpieces is due to people not understanding that resin and hardener form a different chemical structure once they've reacted together fully which has different properties to the two reactants.
Worries about epoxy 'toxicity' seem to mainly be due to the possibility of mixing more hardener than resin and there being residual hardener leeching out.
In the case of a mouthpiece repair, the amount of epoxy would be small and the amount of potential hardener leeching out would also be tiny.
It should be noted that not all epoxies are toxic or harmful, some metal cans are coated with epoxy to prevent corrosion from acidic foodstuffs like tinned tomatoes, epoxy formulas are used to line some types of water pipes and epoxy resins are used in medical procedures like hip joint replacement.
The particular formulas of hardener that are least pleasant are the bisphenol A and amine based ones. Aliphatic epoxy is the safer type. It's difficult to find out much about the formulation of specific brands of epoxy, but JB Weld say that theirs is non toxic on their website. I think Mojo Bari uses JB Weld on his mouthpiece repairs and modifications, so maybe you could contact him, or you could contact JB Weld.

From what I gather, most adhesives and paints for sale to the general public have to comply with certain safety regulations, hence the profusion of water based adhesives in DIY stores.
 

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