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I was wondering if anyone has tried to mold all three pieces (HU kit, cubby hole, and center dash piece) together. My first attempt was with a plastic welding compound, and some body filler for the face, which was then painted honda eternal blue. It turned out great, but then it all started to seperate again. could anyone tell me if there is something stronger to hold these pieces together

 
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Try a thicker weld, and dont use regular body filler it will crack too easily, use a flexable body filler, that shoud work, also make sure to rough up the surface or the body filler wont stick and will crack

 
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you have yo use fiberglass.. It is the only thing that wil truely bond
to the plastic parts. It will not seperate either...