I just had my house reroofed, and part of the work involved repairing
various areas of dry rot. That included repairs to 3 of the gable
rafters. It entailed cutting back the rafter tails and scarfing on (at
about a 45 degree angle) about 2 feet of redwood 2x6 to form the new
rafter tails. They seem to have done a good job (they used Gorilla Glue
and did some toenailing for the joins), but they didn't fill the joins
with glue and there's a lot of open cracks that are up to around 1/8
inch wide. I want to fill those cracks and then prime and paint. I'm
wondering what material to use to fill those cracks. Of course, I want
the join to be very smooth and undetectable and after priming and
painting I want them to continue to look great indefinitely. Can I get
suggestions for what to use? Thanks!

Dan