For example, where there are two joint owners, you can each claim a deduction of 6% of the cost of the car. You need written evidence for all the other expenses for the car, as well as records that show the car's engine capacity, make, model and registration number.
Nail polish will usually last for 5-10 weeks (depending how often you use them), so don't use old nail polish. Store your nail polish in the right conditions. Putting your nail polish upright will really help. If you really want a fresh manicure, store some bottle of nail polish in the fridge to make it nice and smooth the next time you use it.
Last but not least, the question of why does shellac or gel nail polish last longer? must be resolved. Let's start with its ingredients. Shellac nail polish isn't made with nitrocellulose like regular nail polish is; it's made with methacrylate monomers (something you'd find in acrylic nail polish).