Estes Hornet Build Part 3, Fin Fillling

The fin stock was warped, right out of the bag!
After brushing on the thinned Carpenter's Wood Filler I'll have to let these dry under a heavy book.

The grain was raised after the CWF had dried.
These fins might require a little more primer filler after this is sanded down.

Here's the same fin after sanding to surface.
You can't see any raised grain but you can feel it with your finger.

I don't think these fins are actually balsa, but probably tung wood.
They are harder than balsa and filling the balsa grain is different.
I hope the primer filler will seal and fill the leftover grain pores.