This is an on-going problem for many of us. The allergic reaction can creep up on you over time (i.e., you may not be allergic today, but you may be tomorrow) and it can vary widely in symptoms (i.e., sniffles to heart arythmia). Unfortunately, many of our current laser-cut kits seemed to be designed specifically for CA and the interlocking fit is so good it simply cries out for CA. Being highly allergic to CA, I have tried everything in the book and found that odorless CA, particularly Bob Smith Industries, is a pretty good alternative. The aliphatics, particularly the Pica Glu-its (unfortunately, since Pica has shut its doors, it is disappearing from all sources), can be used in a lot of applications with the added bonus of being a lot more sandable than CA. Anyway, there are alternatives out there that work and work well, so keep building...and stay healthy.