On 12/18/2012 11:58 AM, Larry Blanchard wrote:
On Tue, 18 Dec 2012 09:19:29 -0500, Baron wrote:

Context:Plywood built-in bookcases.

I assume I should seal all surfaces in some way, even though the top,
bottom, back and one side will never be seen. True? If so, what should
I use? If it simply doesn't matter, I'll probably try to use up some
cans of whatever is on hand.

Shellac.

Dewaxed.

My experience is limited and I don't think I've used shellac since the
jewelry box I made in the 7th grade. (seriously, 1970) It's hard to
remember, and things may have changed. So tell me why I should buy some
for the unseen areas, other than to have yet another thing to finish
test pieces with.