26’-3 prop shaft strut

NW26

Member II
Currently replacing mine. The original had 4 bolts through the base, but weren’t threaded into anything. Not sure what the purpose was. The base was bedded into a white “bondo” type substance and the inside was glassed over which left a bit of a dome (underneath the fuel tank). The pic is after the fiber glass “dome” was removed and filler chipped away to reveal the top of the strut - bolts had been removed. Long story short, what is the filler/bondo material that the strut is bedded into? 65736826-002E-49DC-9FA7-D3D8AD91389A.jpeg
 
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