how do i create a port flare on MDF baffle

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Tried it on my subwoofer project ... Using automotive body filler to create a large flare of 40mm radius on a 4.2 inch / 110mm port ... But it seems abit like a disaster as the outmost port flare didn't shape nicely ... It just refuse to build up enough body for the outmost part as shown .. please help
 

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