Plastering

You can use a latex primer over oil-based paint as long as it is a bonding primer. bonding primers are best because they are formulated to adhere to glossy surfaces, such as oil-based painted finishes.

You can work out the size of the lock by measuring the distance from the edge of the door to the centre of the door handle or knob. this measurement will give you the approximate size of the backset which will allow you to identify which size lock or latch you have.

Standard adhesive consists of cellulose ether and starch - the right choice for light to heavy paper-based wallpapers. special adhesive contains synthetic resin in order to increase the adhesive strength - perfect for heavy wallpapers like wood-chip, vinyl, anaglypta or textured wallpapers.1

Always prime before painting concrete. begin applying concrete primer by using a paint brush on the corners and edges of the concrete floor or surface. use a paint roller to apply primer throughout the floor. two coats of primer are recommended for best results.

Bleach works very well on any surface,for outside, i dilute it 50 %. for interior rough surface i would try rubber gloves to hold a cleaning rag wet with 50 % bleach , it will take a couple minutes to work .