Bondo

Yes, that's the one.

I get best results taping very close to the gap when I apply with a spatula (tang end of an xacto #11 blade)

 

I use Napa/ Martin Senour glazing putty. I'ts light grey. Works. Quick dry , easy work and sand. Haven't tried Bondo,but I will. For small gaps I use Dap Kwik Seal water clean, paintable caulk. Don't leave it on to long! Please don't go by what i'm saying, but it works for me

Yes, My go to of choice. Hope you like it too.

Is that the Wedell Williams Racer? AARDVARK

Aha !

That's the one . Just remember . Apply it in very thin coats otherwise you might still have a depressed area . It says that right on the tube . Wet sands beautifully though .

In addition to the Bondo red solvent based putty, there is Bondo Professional Glazing & Spot putty.  Bondo red is essentially the same as Dr Microtools filler putty.   These solvent putties take hours for the solvent to evaporate and harden.

 

 

Bondo Pro is a 2 part putty.   Mix a quarter-size dab of putty with a pea-size spot of hardener and apply.  Work in small areas and quickly.   It hardens in a few minutes  allowing you to sand and continue work without the overnight wait for the solvent outty to dry.  This putty sands and feathers well.

There are also several other brands for this stuff- all pretty much the same.  Ditzler, of auto paints has one, I have a tube from 3M, I forget the other brands right at the moment.  I have been using the stuff- vary from brand to brand depending on which stores I go to- for models for about thirty + years.  I was a teen during the hot rod/custom car craze, and learned to paint cars from friends.