Yes, a tack cloth is a must. Any debris on the model will be amplified by the covering. ArcticCatRider's post is correct. Sanding is the most cumbersome part of building a model, but it will give you the best aesthetic results. Don't get lazy. It will take a long time and a lot of effort, but it is worth it. After it is well sanded, find a very clean room to do the covering. Don't let any debris get near your baby.