I have lots of questions, but will start with this.

I have built the basic P-38F air-frame and am currently filling the seams. I have done both the top and lower fusealge and sanded them down as best as I can. I used a combination of 1200 and 800 wet and dry.

Now, I have filled where the wings join the fuselage but then thought there might actually be a join here in reality.

However, the gap was bigger than it should have been. I have also done the horizonal stabs, although with a 1/72 it's a delicate operation. Do others fill the wing root gaps, etc?

Yes, they do. On evrywhere where there is a gap in a place such as you said "on the wing joint to the fuselage" you use fillers and then gently sand it down.

Cheers, James. Will do some more work on it tomorrow maybe.

James et al,
This may help with your wing joint discussion

Excellent photo, Chuck! Thanks for that.

Happy New Year to all!

Welcome to Aeroscale.

This site will help you build better models. You should feel free to ask us anything here. We all learn from your questions.

If the gaps are small enough they can be filled with a variety of things. White glues, Micro Krystal Kleer, thinned putty, super glue or even White Out correction fluid. If the gaps are larger, try filling them with strips of styrene to reduce the amount of putty being applied. Apply too much putty and you run the risk of melting the plastic. Putty also has a tendancy to absorb paint so you will still see the seam even if smooth when you go to apply paint. Take your time and feel free to ask what ever questions you may have. There are enough folks here that somebody should have an answer for you. Welcome to the site! "Q"