Recently I had my first try at a UV-exposed board
(because I have nightmares from trying to align paper properly for a double-sided board with the laminator, ha ha)
I used this photoresist film:
http://www.ebay.com/itm/10pcs-Dry-Film-Photoresist-Sheets-for-DIY-PCB-6x8-q-/320735055777 which worked pretty nicely, although it took me a couple of goes to get it on the copper without bubbles!
Some UV LEDs on a sheet of protoboard for the exposure lamp, and to test out different spacings etc (Thanks to Chris for the LEDs!) - hopefully I can make a proper exposure box once (if?) I get the other issues sorted.
I used my Canon iP2000 inkjet printer and inkjet transparency sheets to make the transparency, unfortunately it did not come out as good as I had hoped, as solid black fills had many quite light parts in them when held up to the light, and when exposed left a speckled pattern on the developed board.
I used a solution of Sodium Carbonate (Washing Soda) to do developing.
Today I tried with a Laser printer but again, holding the transparency up to the light I see too many light areas. I haven't tried exposing using that printout but I feel it will have a similar problem to the previous one.
What does everyone else do to get their printouts opaque enough for the UV process?