Via github, you need to recompile engine
Any news? is 4.17.2 here and decals still disappears too fast 
For some reason the link is unavailable (8-th of April, 2018).
its already working in 4.18 ! hurray! i suggest it you to print a string to find out the size first and then change accordingly
Any news on this?
I’ll check it. Thanks.
working on 4.18… in blueprints & material nodes it is already exposed