This pen has been really useful! I have found it takes a little while longer than expected for the marks to appear, although that might be because the weather has been cold so it's taking a while to dry? But it certainly disappears when heated as advertised. Unfortunately I seem to have been going through it really quickly while marking out a jacket, so while it's a fairly good product I couldn't afford to use it on every project, especially ones requiring long lines of marking. I guess you pay for the brand name.