I had 50 m² walls covered with bamboo fiber détapisser ... the horror! So I bought this. Initially I scrupulously followed the directions and tested to distribute it over my walls with a sponge ... not great because long and messy ... Then I found an old empty spray in the past that contained a product against insects .... I sprayed my walls faster but I made sacred bulbs ... Finally I found THE SOLUTION! My garden sprayer, one who serves me for the Bordeaux mixture or weeding! And there! magic !!! This product is a REDOUTABLE efficiency! Feel free to spray your walls well, wait 10 minutes and see ... I will use more strippers or other products thereof. For that price in addition, it is really a purchase to make your eyes closed!