I remember that my kit (Farside-X) included soft balsa. I used AeroGloss Balsa Fillercoat and painted with dope to get the smoothest, glossiest finish, which I did, but some grain was still visible, and the fins ended up wavy as a result of the shrinking of all the fillercoat and dope. first two flights (B-A-A , and B14-B-A) were pretty good, but snapped one fin at the root from each of the first two stages on landing the first time, lost a fin on the second stage the second time. Replaced it with hard balsa. No wave on that fin.

On the third flight I went for broke with B14-C-C and of course lost the upper stage, but it held together!

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Roy
nar12605