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There is a way to save some money on resin when using a foam or other substrate that isn't compatible with polyester resin.
Apply a couple of coats of epoxy resin first. Spraying it on will get the smoothest coverage. You have to be 100% certain to get full, hole free coverage with the epoxy.
For big projects, use only the laminating resin until the final coat, then spray on a thin coat of finishing resin. The finishing resin contains a wax that floats to the top, sealing it from air so the surface will cure. Don't need this if you're vacuum bagging - or you can cover the resin with some type of plastic sheeting that won't bond to it.
There's a "universal" type with less wax but if you leave it too long it has to be washed with acetone to get more resin to bond to it, and the results can be iffy.
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