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How to Repair a Windshield Chip or Crack


Here we have a crack coming down from the top of the windshield. With the impact about two inches from the molding, it comes down and curves goes over by the rearview mirror. This crack is about 17 inches long- it’s definitely a job for the multi head injector. Windshield Repair Kit to Fix Large Crack.

how to fix a windshield crack

Windshield Crack Repair▼

Here we have a crack coming down from the top of the windshield. With the impact about two inches from the molding, it comes down and curves goes over by the rearview mirror. This crack is about 17 inches long- it’s definitely a job for the multi head injector. The first step is to put a stop drill at the end of the crack the goal is to drill about halfway down to the plastic what you do is you drill a little bit and you make a light tap if you drill too deep you’re not going to get the correct bullseye if you drill too shallow and you tap too hard you can cause the crack to go past your drill hole so with practice you’ll get good at this but I’m going to drill partway down and I’m going to give it a little tap you can drill on low or you can drill on high if you have a new bit the bit drills faster but with a little practice you’ll get a good feel for this drilling and tapping and stop at the end of the crack once you’ve drilled and you think you got the proper depth we’re going to give a little tap with your bullseye tapper and see we didn’t get a bull’s-eye which means we’re too shallow so we’re going to drill just a little bit more it doesn’t take much just a little bit more and sometimes you’ll get the bullseye you wanted now we’re going to give another light little tap and we still didn’t get the bullseye we wanted so we’re going to drill a little bit more the goal is to drill a little bit at a time and not get too deep because then you won’t get the bullseye there we go we got our bull’s eye that’s exactly what we’re looking for now we’re going to load the Malta head injector the Malta head injector needs to be loaded from the bottom remove the o-ring and then we’re going to add six to eight drops of resin depending on how long a crack you’re going to repair but usually six or eight drops is adequate for most cracks up to about 24 inches then you want to back the piston off if you need to add a little more I put about four drops in the first time realize I didn’t have the piston backed off far enough okay now we’ve got our eight drops approximately now we’ll reinsert the o-ring there isn’t a right or wrong way to put the o-ring in they’ll go in either way you kind of put it at an angle and then pop it in you’ll get good at this with practice easy there’s the concern now we’re going to load the second barrel on the Malta head injector the same way as we loaded the first barrel back your piston off Oh though you were messing with learning at about eight drops of resin Q instead of cutting in the film with an insert at reinstall your o-ring again insert it and cut cut the rest of it that’s it okay and then we’ll do this shot of me now we’re going to add the suction cup lubricant you need to have a good amount of lubricant when you’re doing these long cracks because you don’t want your tool to stick partway down the crack if the tool sticks it will cause you to air up the crack that you’ve already injected yeah so we’re going to mount the tool you want to have the injector and adjusting bolt backed off you slide up the crack keeping your injector right over the crack put it on about a half-inch past your bull’s eye stop turn both the injector and the adjusting bolt down until it touches the glass and then go about another turn Claire and everything we’re going to put our extension arm on because we’re having a little hard time reaching this crack since it’s clear up in the middle this is a patented extension arm that we’ve added to this tool now you turn up the pressure on your first barrel Oh lifting pressure on the resume then we’re tend to pressure up on the second barrel now the crack is tight on the tip so we’re going to have to flex the crack a little bit to open it up you can either use a crack expander I use my son thumb sometimes I use just like a little wooden dowel just something to get it flexed open just enough that the resin will start dinner and we see the resin starting to go in you can see I go down to the crack not back up a little bit so I can see the resin going in it’s just the first two or three inches that are going to be tight if that depends a lot on the crack the trick is to be able to flex the crack open just enough that the resin goes in but not flex it too hard and cause the crack to spread past her stop point if this does happen you push too hard to spread you just have to go out and put another stop on the crack you will want to keep the crack out of the Sun until you get good at it now a lot of times I’ll repair right out in the Sun because I’m pretty confident and what I’m doing and I wanted you to be able to see on the video if I started to shade this repair you wouldn’t be able to tell what’s going on but but if you’re good enough yeah you can repair right off the Sun we’re just going to finish following the crack right up to the edge make sure you’re getting all the resin and both barrels going in there it’s going to start leaking out because the crack is gapi at the edge we run all the way up to the edge and then I’m coming back to the impact point to leave the resin under pressure on it a little bit to make sure it feels good then you want to cure this crack in about ten or fifteen minutes in the Sun you want to make sure the crack is good and cured before you pull your tool off because you might flex crack shutting doors can flex the crack people didn’t out of the vehicle or moving around the vehicle can also flex the crack so you want to make sure that the crack is not disturbed while you’re injecting it and while you’re waiting for it to cure under pressure if you want to you can use cure tabs and pin filler and that will help air getting in the crack if it does get flexed you just lay down the pit filler and lay down tap next to tab next to tab and that’s a good precaution when you’re new then we’re going to clean up the extra grease along the crack I use a razor blade just to make it easier then pull the tabs off now this is after we’ve let it cure for 15 minutes room and then just scrape straight down the crack with your razor blade just keep working your way down the crack all the way to the edge if you don’t have sunlight you can use a cure lamp to cure and in the evening on cloudy days that’s a really good idea when it comes to cracks you want to make sure they’re good and cure before you let the vehicle drive away now we’ll take some glass cleaner we’re going to fill the pit first sometimes the impact is fairly large where the rock started to crack so we’re just going to fill that in with bit filler and a tab and let that cure now pit filler were cure in about 15 seconds to 30 seconds it doesn’t take long then you can pull the tab then you want to scrape straight on if you scrape at an angle then you’ll gouge out what you already did clean it up with some glass cleaner inside and out we have less than a quarter of one percent failure rate on these cracks now I’m going to trace with our scribe down the crack so you can see where it was now this crack was about six months old so it has a little dirt in it once I get to this part you’ll see the dirt that lasts six inches has some dirt so it shows up a little couldn’t really see most of it I can’t you.

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