The first sinew bow I did I put all 3 layers at once I read every book on sinew I could get my hands on Jim Hamms ,TBB, Laubin, & whatever artical I could & after I was done it look like a big pile of junk & even posted on it and I think it was Pat B said who cares as long as it peforms but after about 2 weeks after curring a little it looked realy good & I did what Ed said filled in some with strips of sinew , in the end it looked good enough not to cover up just sealed it & good to go. Sinew is interesting stuff but has a pretty fair learning curve Im learning new stuff every bow.