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Possibly the Photo Paper you are using. If you don't want to try multiple types, you might want to just go for the high gloss magazine paper.
Possibly the Printer. A business Colour Laser. Not certain how good the 'ink' is for this.
hey why dont you try using ohp sheet or u can call as transparent sheet which i find very effective and what i do is first clean the board using detergent soap and after that keep in mind not to touch the board with your fingers and remaining procedure u know it...
sorry my English isn't good
Unless you have paper with a high clay content the toner get between the fibers. Better to look for that sort of magazine paper as pointed out in many threads. But you might get this paper to work if you can get it to come off by gently rubbing the paper after soaking for some time in hot water. Some fiber will remain in the toner but that is ok.
You can wait a few days after you apply the toner.
Remember you have (or at least should) a soldering iron.
I use mine to "tack down" the sheet. Be sure to oversize your boards by a 1/2 inch or so, then in that half inch on the side and the bottom, have that as a filled in "ground plane".
This results in a big area of toner.
Rubbing a zig-zag over the side and bottom "toner planes" with your soldering iron does a real good job for tacking it down.
If you are using the laminator method, insert the tacked down edge first. This results in good transfer.
By modding/hacking the laminator, you can slow down the feed rate, and you can get to the point of only needing 1 pass.
By the way: Your soldering iron is a good way to see if the toner you have is even worth using for the transfer process. If you start to burn the paper and the toner does not stick, then you are just throwing your money away.
Run it over the back of the paper at about 1 inch per a "one-one-thousand" count speed, wait 10 seconds, and check for adhesion.
Do not try to remove the paper immediately before the toner has had time to cool. It needs to cool from the molten state in order to adhere.