When we're working on our models, we often have to fill and sand different parts in order to make them fit perfectly, cover holes, etc.
The thypical consequence is that we either cover or sand down panel lines, so the model loses all detail. So we have to engrave the panels again; this can be done with the hobby knife, but it's risky both for your model and for your fingers' integrity, as the blades are hard to control when being used for this.
The solution? A tool created specifically for this purpose, that ensures maximum control and allows you to handle it from different angles to achieve optimal results.
We have to prepare each shipment individually as they are ordered, so allow us in 3-4 weeks for it to arrive in USA/Canada (to be safe) and 3-6 weeks rest of the world, though thy are usually delivered much faster.