seam sealer

Whats the best/most economical choice with regards to paintable seem sealer for inside the trunk and floor seams? The white stuff??
also: where to get it.

Underneath, I like the asphalt roof sealer, $3 a tube. Excellent sealing, stays slightly flexible, paintable too. I'm just a little leary of using it on the interior.
I then spray undercoat over it, once cured. The nice part is when its still somewhat tacky, you can smooth it, brush it, stipple it for a matching "look" to the surrounding area.
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