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Crack expander

Posted: August 18th, 2017, 7:47 am
by chad
Anyone use a crack expander to fill in a star break that has long legs( like 1.5 inch legs) that seem to long for just the tool? Thanks

Re: Crack expander

Posted: August 20th, 2017, 12:47 am
by screenman
I tried one 25 years or more ago, I have not used one since.

Re: Crack expander

Posted: August 21st, 2017, 8:12 pm
by Clarity Glass
Shouldn't need to use crack expander unless the crack leg is tight. Carefully flex/put pressure on crack watching the resin flow to crack tip.

Re: Crack expander

Posted: August 21st, 2017, 10:14 pm
by screenman
It does of course matter if the leg is surface or sub surface, pressing on a surface crack will often close it up, whilst subsurface will open it.

Re: Crack expander

Posted: May 7th, 2018, 5:52 am
by IRONSIDE
Is there any information on at what length a crack changes from sub-surface to a surface crack?

Re: Crack expander

Posted: May 7th, 2018, 9:59 pm
by screenman
Just drag your scribe across the top you will here a click if it is surface.