PC-7 and PC-11 are amazing epoxies. I always keep some handy in case I need something to stuck to something else. Forever.

http://www.amazon.com/PC-Products-Two-Part-Multipurpose-Adhesive/dp/B000BOHJJ0

http://www.amazon.com/gp/product/B008DZJJGU/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944579842&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B000BOHJJ0&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1KRJW33VM2QC1GVP85R7