Last night I started playing with the X-30 foam. The directions were to mix it, apply it, and stuff the blue foam in between the ribs. Well I mixed too much at first. I was not expecting the expansion. Then I tried spreading it on the ribs before it had hardened and it just did not spread very well. I found that it poured pretty good so I made up smaller batches and poured it in the gaps. When I finished some of the the left over expanding cups (you can see them in the picture) hardened incredibly hard. I wonder why you don't just pour it in between the ribs and let it go. Oh well I am just following directions. Notice the two floor bottoms standing up. That is one too many.