@pashok84,
The quality of laser toner matters. Even the heat adjustment matters. I suppose magazines having thinner paper can be used. The paper can be false mounted on ordinary A4 sheet using a small 3m sticker.
i have some Pulserpro FX papers in A4 size. Very costly at Indian Rs140 each sheet and sold in 20 lot in one packet. it is locally sold from Mumbai, though made in USA. the paper is thick and like blotting paper with dextrin coating on one side
while printing , you have to define paper thickness, and toner darkness level. then while ironing, you use non auto old types, with max heat. try at say 30 sec of hard pressed ironing. with normal paper fibers continue to trouble you. the copper surface needs to be little rough by kitchen 3m scrubber, and clean from any oily or finger prints.
even with JK and DESMAT brand glossy photo papers , the problems are faced.
I came to know from a friend that Canon Photo glossy paper works well and the paper floats off after placing in hot water, post ironing.