The fit is great, but I simply cannot get rid of underside fuselage seams! Its the same with the pup and tripe for me. Grr.
You know I have exactly the same issue on box flat seams. The Bristol I've just finished I filled, sanded, primed, filled, sanded, primed ....... countless times and still the seams remained. Then I remembered some wag stating if you make the seam bigger it fills better than a microscopic seam. Did it hell I just had a bigger seam, by now I was not a happy bunny so my next wacky plan was to skin it with the thinnest evergreen sheet, but I attached it with liquid glue that just melted through the thin sheet. Solution was to buy another Bristol and start again.
I found that having a good fit to start with is critical and use liquid glue and ensure capillary action takes it all the way down the join. Hold the parts apart ever so slightly for a few seconds to soften the plastic and then squeeze watching for a lovely oozing bead appear all along the seam.
Where it doesn't there will be issues and I find Mr Surfacer in its varying thicknesses usually gets there in the end, but its vertainly not like a nice curved seam that disappears in seconds.
