If this will be the first time you’ve washed it after a month’s ownership, it’s likely to be pretty grubby, and the paintwork will probably also need decontaminating before applying wax or sealant. As per @Legojon’s post above, don’t know how much you’re into car washing and detailing but in my opinion, the key to keeping your paintwork in good condition is your washing technique, and removing most of the dirt using a ‘‘touchless’ pre-wash stage, before making contact with the paintwork - minimal (or safe) contact with your paintwork will keep it looking good for longer, and adopting a safe washing technique will
help with this.
Agree 100% with
@Legojon regarding a pre-wash stage with snowfoam, which will remove much of the dirt and grime before undertaking a safe, two bucket method wash, using a lambs wool mitt, then drying with dedicated soft microfibre drying towels or a warm air dryer (not a single bucket, sponge and chamois leather, as you’ll be inflicting swirls into your paintwork).
Also, to prolong the effectiveness and durability of any protective wax or sealant, preparation is key. It’s always preferable to decontaminate your paintwork first (claying, iron fallout remover and tar/glue remover, then rinse, wash and dry again), followed up by a polishing stage to remove any scratches or swirls before applying (two coats) of wax or sealant. When applying the wax or sealant, less is more, so apply very thin coats on a foam applicator pad, leave to cure and then buff off with a soft microfibre cloth.
My current, value for money favourite wax and sealant are;
- Collinite 845 Insulator Wax - a liquid wax, which is easy to apply and buff off and has very good durability - I usually get 5-6 months good protection before it needs re-applying.
- Fusso Coat 12 Months Wax (there’s a dark and a light version). In spite of the name, it’s actually a sealant. It claims to give up to 12 months protection, although realistically it’s probably good for 6 months. It’s extremely hydrophobic, so has very strong water repellency properties - water just beads up and rolls off!