For electric powered box destinations, simply just put in the MLV over them but mark the destinations to help you come back to them. For finest effects, utilize Putty Pads throughout the again in the containers prior to the applying on the MLV. TMS Soundproofing Mass Loaded Vinyl stands out https://massloadedvinylproductfor01171.suomiblog.com/about-mass-loaded-vinyl-product-for-soundproofing-54516339