Re silicone my 90

[oilfieldsafety]

Well I started putting my 90 together on Sunday and noticed that the previous owner has really chewed the silicone in the corners badly. If I cut out the existing silicone flush to the corner leaving the portion that is actually between the glass panes and replace the rest, will this still be strong enough? In the past on other types of projects I have noticed that new silicone didn't seem to bond well too previously cured silicone. Your thoughts / expieriences are appreciated.

Shane