How to fill gaps between plywood caravan walls?

[Peppers]

Hi team, it’s been awhile since I posted. I am seeking suggestions on how to fill gaps between plywood. Now I am no expert on ruling a straight line or cutting  lol, hence the gaps. Don’t worry about the corners. They have been sorted. I haven’t fully nailed the ply in as yet. 

Also looking at painting once I am done. Thank you all

 

[JacobZ]

Hi @Peppers,

It's fantastic to see progress has been made on your caravan restoration.

Considering you are planning to paint afterwards, you can use a wide variety of filler products. I'd suggest something like this UNi-PRO Multi Purpose Interior Filler would be a good option.

You can apply it to the gaps using a joint knife, allow it to dry, then sand it and finish with primer, followed by paint.

Let me know what you think.

Jacob