I had proline 4500 deliver with my kit but my scale turned off multiple times while mixing so I had a lot of waste - ordered a pint and it was worth it. Delivered super fast so I wasn't delayed in my build at all. I really like working with this epoxy - it's thick consistency and heat resistance is nice. Made super nice filets on my minimum diameter kit. Some complain about it being messy but that wasn't my experience - very easy to work with. Also sands very nice.