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i have the angling ai little hammer mold, which is a 2.75" swimbait, 4 cavity and a fairly large runner, with 4 individual sprues for each cavity (hard to explain, but it takes a decent amount of plastic, check the pics on the ai site) and it fills very easily with around 2oz of plastic. i would think with a normal sprue/runner, you would be fine with 6 or 8 cavities. the 3.75" version fills with about 2.5oz, just for reference.

It’s easy to assume anyone asking about a build problem did all the prior build steps in the same way and with the same products as you use, which obviously ain’t true. That mistake leads to a lot of bad advice but it’s hard to avoid on an Internet forum. To make clear, I use epoxy as an undercoating and water based acrylic paint, so there’s never a solvent based coating on a bait before applying MCU. Epoxy is about the most chemically inert coating I know for a wood bait. And I use acrylic latex color base coats. If you mix solvent based coatings on a bait It’s always a crap shoot whether it will work, so good luck there.

Used some rattle can Durachrome once and that's the one and only time I've ever had DN wrinkle. Solvents are notorious for not playing well together. A lot of the procedures we use to make lures is really nothing more than a "witches brew". We use a lot of things in ways that were never truly intended to be used in the way we do. The thing you have to do is isolate where the problem started and don't do that anymore. That's easier said than done a lot of times, but unless you have a degree in chemistry or can afford to employ a lab full of chem techs then it's the only choice we have. good luck................Ben