Here’s a complete recipe that yield 18.7mg strength.
Recipe: Nutella
Amount: 3 ml (based on 30 drops / ml)
Nicotine liquid 1: 36mg PG Base 36mg/ml 52% 1.6ml 48 drops
VG: Plain VG 15 % 0.5 ml 15 drops
Flavoring 1: TPA Hazelnut 10 % 0.3 ml 9 drops
Flavoring 2: TPA Sweet Cream 8 % 0.2 ml 6 drops
Flavoring 3: TPA Chocolate 8 % 0.2 ml 6 drops
Flavoring 4: TPA Marshmallow Or Cotton Candy 2 % 0.1 ml 3 drops
Overall nicotine strength: 18.7 mg/ml
If you leave the VG out completely and add more of your 36mg PG nic juice, it will end up about 24%.
When you do a mix, put your flavorings in FIRST, then add the unflavored VG or PG and put the Nic juice in last, then shake the living shit out of it.