How do I fill holes in a model?

There are many products on the market for filling holes:

There are plastic putties straight out of the tube, there are two-part putties that you mix together by squeezing between your fingers until they change to one uniform colour and even liquid fillers, like cyano gel.

Most model makers will have a selection of all these which you can build up over time.

When using plastic putty, simply apply to hole or joint.

I then use a wet finger while putty is still malleable to remove any excess. Most putties don't shrink when dry and you can then paint straight over the top.

Always read the manufacturer’s instructions before use as different products have different criteria for working the putty while wet and when dry.