I met same problem in all my star break reapairs and I don't know if it is usual and should be accepted.
Please take a look at above picture. When I finish my repair in a star break like this, I can observe that the resin has been penetrated to posistion both "A" and "B" position, then I use a UV light or just put in the sunshine to cure it. After the resin is cured, I can hardly find the bright line both "A" and "B". Then I use a scribe to press both on "A" and "B" position to see if it is bonded firmly, on "B" position there never has a change, but on "A" position I can see it is not bonded as firm as position "B", the bright line shows a bit again and it tends to extend a bit if I press harder.
I know position "A" should be much tighter than position "B", so resin should be penetrate less than position "B", but I confirm the resin has penetrated into position "A". Is it usual or unusual that position "A" is not as strong as position "B" due to it is tighter? If it is unusual, what is the reason for that? Thanks.
When you do the curing, have you already pulled the injector off the break? If you have, try curing under pressure while the injector is still on the break and than after removing the injector, cure as usual. It is possible that when you remove the injector the resin which had been pushed all the way to the ends of the cracks starts to back up toward the impact point, therefore leaving the ends not completely filled. After a complete cure, the ends should not move when pressure is applied with a probe.
I disagree with Dave about curing under pressure, but I agree with him that there should be no movement in the end of the crack after curing. That is not acceptable.
Brent Deines wrote:I disagree with Dave about curing under pressure, but I agree with him that there should be no movement in the end of the crack after curing. That is not acceptable.
Brent Deines wrote:I disagree with Dave about curing under pressure, but I agree with him that there should be no movement in the end of the crack after curing. That is not acceptable.
What is DK's solution to the original question?
It seems plain to me that either the break is not getting filled properly or it's not getting cured properly. When I watch resin flow into the end of a crack and cure it there is no movement. With the limited info we have been given to work with so far I can't say if the problem is resin, equipment, moisture, contamination or technique. Maybe as the details unfold we can make some more educated guesses but for now all I can say is that if you have movement in a break it is not properly repaired.
By the way, my comments about not needing to cure under pressure only apply to Delta Kits users so don't get all riled up if you are using a different system and get best results by curing under pressure.
I can read between the lines here and say that when under pressure, you should apply the same pressure that you are doing AFTERWARDS to make the "bright line" show - it will then fill with resin.
I've used both kits, one that cures under pressure, and the Delta kits - either kit will show the same results in this case as the tight break needs to be opened in order to fill.
Just a side comment, you say "I use a UV light or just put in the sunshine to cure it" - if you have a light - USE IT.
The aim with both types of pressure/non-pressure systems - in fact, WSR's in general, is to cure as quickly as possible.
As you probably know, if you can make that "bright line" appear AFTER a repair, it's not fixed and could possibly continue to break causing an unhappy customer.
If you cured it already, capping off the end of that break is the only way to be sure it won't get worse.
Have a great day!
If the job doesn't mean more than the pay, it will never pay more.
pommy wrote:
The aim with both types of pressure/non-pressure systems - in fact, WSR's in general, is to cure as quickly as possible.
What if the UV light is not strong enough and it takes more time to cure the break? Will it not as strong as the reapair under abandant UV light?
I have one customer complaining "A" position was not strong enough, I remembered the repair was cured under the twilight(4-5 PM) and it took about half an hour to cure the resin.
I am sure that the repair is fully cured by now.
If you have movement, you have air.
Its not the fault of the cure light
It is the failure of the tech to replace all of the air in the break with resin.
Practice makes perfect.
I always flex starbreak legs and hold that flex, that way I can be sure that I have filled right to the end of a leg. Sometimes as we all should know the end of a break is not where it appears to be, hence the flexing.
I would never do a repair without using my UV light, which of course has the bulb changed regularly.
