Here is a Good advice, i have a wall decals company, and in my country its very common that people paint with Semi-GLOSS paint. the oracal 631 will no stick to this paint, becouse this tipy of paint its to oily... its used for exterior but some people used it for interior... you could notice the semi gloss paint becouse the paint has a very notisable GLOSS.... THIS IS WHY THE VINYL WONT STICK.