I found that when I used the double sided adhesive from digital darkroom that it made my cards way to thick (i use Ilford pearl & Epson luster(260)
Its a lot of work, but my solution was to use InkjetPress Duo luster paper & then laminated the 8.5x11 sheet and cut them down from a 8 wallet template made in Express Digital. Total cost with paper, ink, lamination about 1.57 per 8 cards plus my time to cut them apart. Parents LOVE the sturdy, glossy card.
Mike