How to shellac/poly the inside 5 sides of drawers (with a sliding bottom)


I've got a never used Purdy 3" natural brush and could use shellac, but I've got 1/2 gallon Minwax Spar Poly only six months old. So there you go. I've got to finish the inside 5 sides of eight drawers. The outsides will be semi-gloss oil. I'll do the outside paint first, then mask the outside top perimeter edges to do the inside. But its got a 1/4" deep groove 1/4" for the bottom for the approx. 18" x 18" 1/4" nominal birch plywood bottoms to slide into. I have been here numerous times with paint w/r/t keeping runs away, but I know nothing about shellac, and have only ever used polyurethane on horizontal surfaces. How should I swivel these drawers to prevent runs while painting, or letting them dry. Before I get started. I can see major issues with the poly which I would like to have. I'm gonna 220 sc sand between 2 coats.
Actually what I was thinking was this: Is it possible to do the bottom separately from the sides to keep it out of the way, then slide it in finished? -I've got a an oversized hole for a pan head screw at the middle of the back to hold the bottom to the back, but other than that the bottoms just slide in the groove. I have designed enough room for expansion from side to side and front to back. Can I apply the finish to the bottom separately, then slide it in. Because if I have to do it while its in, that is a constraint that affects the whole application. I do not know how to control runs If I do it this way, I'll get finish on the inside of the groove, but will that matter w/r/t the expansion/contraction? I think the actual dimensions are birch bottom: .220", and 1/4 straight bit: ~.250", so there is about a 1/32" play in the groove thickness wise.
Mind you, I have no control over what my mind thinks up, nor how this will affect my result.
Like, how do I position the drawer to dry so I don't get runs?
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Hang & Spray :)

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But what about back to flip, slide and hope?
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Forget finishing the insides. If you want. Tom
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Somone here, towards the end of last year, recomended finishing drawer interiors with shellac. Not full strength from the can. I cut my bulls eye orange shellac 50/50 with denatured alcohol, brushed it on and called it done. When cut this much it doesn't really build up and you wont have an issue with runs. It will not leave a gloss build-up but just enough to seal the wood. Worked great for me and was easy to do.
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