I'd just buy the standard buytrate sanding sealing that's been sold for years. The home brews and stuff are fine, but I've found it much easier to buy it ready to go. Whatever you do stick with a system from start to finish to avoid compatibility issues. If you want to use Midwest, then use Midwest for the whole project. If you like Sig products (much better than the Midwest in my opinion) use Sig for it all. You didn't say if you were doing a dope finish or just needed to fill the weave/grain so the system advice may or may not be necessary.

Also I've had good luck mixing a little white dope in with the sanding sealer. That way it covers better and gives a more uniform surface for the first coats of color if that's what you are doing.

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