Foam leading edge

[rmarshall234]

I've decided to foam the leading edge of my wings where it begins the curve to meet the wing tips and am looking for pointers. I will hotwire the block of foam to match the contour of the ribs but how do I fill in the remaining gaps? Especially the leading edge. Do I use "great stuff" expandable foam? Fill it in with micro balloons, or something entirely different? I wasn't planning on foaming the tip itself....unless someone strongly recommends that I do. I am building an Acroduster II and here are pics of where I am stuck.

Responses are greatly appreciated!

 

[Beej]

 

[Neil]

 

[Xavier]

 

[rmarshall234]

 

[rmarshall234]

 

[Beej]

 

[s_m_wood]

 

[Neil]