I use both but i pick acrylics over enamel if i have the colour in both types, i wash the kit in hot water and a bit of washing up liquid then rinse under a hot running tap dab off the water then let it air dry for a day or so, I've never used a primer on a kit yet i just paint straight on to it, I've not had the acrylic rub off when handling but i do hold it very lightly and the way i do models it could be days between coats and i always leave it a day or so before i mask it up and I've not had it pull any acrylic paint off but i do leave it a few days before i take the masking tape off to make sure its fully dry. A lot of my acrylic is humbrol i always use the small pots that come with starter sets I've found them to be great just give them a good stir before use, i also use revel and vajello acrylics and I've got humbrol and revell enamels and i use any combination of acrylic and enamel from any manufacture on the same kit, i just give anything a go and see what happens when it comes to painting have i just been lucky so for with this I've not had a problem yet.