Never ever use expanding foam in such a small thin area, it will look like John Merricks head within 5 seconds, and delaminate a whole area of your sidewall. It is an extremely strong material. Injection of a suitable glue yes , but foam no.
WARNING.!!... The above post may contain an opinion
‘In the beginning God created the heavens and the Earth. Then he said, “Let there be light.” And there was light. Which means he made the entire universe in the dark. How good is that?’
This mornings sermon......Jesus walks on water
This evenings sermon...... Searching for Jesus