It is very important that you cure the repair under pressure
in the sun or with a cure lamp for at least 10 to 15 minutes after the
injecting process. This lets the UV reflect in a start the resin curing
process. If the tool is removed to soon air may creep back into the combination
break repair before it has time to fully cure. Curing under pressure prevents
this from happening. It is fine to slide the tool away and look to see how the
repair is filling, but only look for less than 10 seconds and the slide the tool
back on and continue to cure. You do not want direct sunlight or UV until you
are sure the air will not creep back in. The mirror helps the curing under
pressure by reducing the time and aids in being able to see the repair filling
with out sliding the tool away to look at the progress. If you slide the tool
away and you see the air which will show up black coming back into the repair
immediately slide tool back onto the combination break repair and continue to cure
for another 5 minutes.