This solution just strengthens it, it wont over do the process so will be ok and it will stop expanding once there is no more room. wont over expand.
I did the Race formula for sills and the normal one for B pillar for 1380( Perdana) iswaran and wira cheaper. Below 1k. Paid extra for the race formula which is stiffer.
No regrets.
log into autofoam.com.my to read reviews I'm not getting paid to do this, just satisfied with the product cause "this shit works" as quoted in the shop.