This old Monogram Mustang has a few fit issues with big gaps and parts that are troublesome to even up the join. I'm using Perfect Plastic Putty to fill in some of the gaps. This stuff is great.
I ended up with large gaps on both wing roots. I closed up the gun doors which left small gaps. I filled them with PPP and let it dry a couple of hours.
Then I use a wet Q Tip to smooth out the filled areas. I actually have more control when its dry than when wet and soft. Then just wipe the area to remove any grit.
The bottom fuse was sanded cause of the ill fit in this area.
The fit is really bad and it's probably better to leave this panel off to expose the bottom of the engine but I wanted a clean look of the pony. More PPP was used to fill in the gaps.
Since this build is requiring filler, I won't be using Alclad cause any tiny imperfection will be magnified under the Alclad finish so I will be using Floquil Old and Bright Silver along with Platinum Mist. I managed to grab several bottles from a couple of LHS as it was being discontinued. It's a shame as Floquil is just a joy to work with.