Bruno wrote:I too will order the new injector, but I have an additional question, if the air can escape, how is it that the resin doesn't? also if you are designin another product, I would look into a system that does create a stronger vac, as it considerably speeds up the repair process, just a sugestion.
If you feel a stronger vac would speed up the repair process, you're not fully convinced yet. The vac cycle is NOT what makes a repair process faster. Sure, you need to vacuum, but not to the extent that you think. I would highly recommend taking one of our free training classes, and would be good for anyone in the business, regardless of how long they've done windshield repair.
At least call for tech support. Tech support is free too, we usually don't bite (except Matt). It's much easier to explain and discuss specific problems or questions over the phone.
As far as how air can escape but resin doesn't, it's simply gravity. When you pull a vacuum, the air is lighter than resin, so it goes to the top. The piston is no longer in contact with the seal, allowing air to rise to the top. When you put it down in the pressure cycle, the air escapes (path of least resistance) until the piston meets the resin again, then meets the seal. If you have enough resin, once the piston touches that seal, all the air is out.