Technical Guide
Bonding Of Plaster
Many times problems are faced when cement plaster is applied over reinforced concrete surfaces, generally on account of poor interfacial bonding. Soffits or ceilings are the most difficult. This difficulty can be overcome by providing a 'Bonding Coat' to the surfaces. Polymer based chemicals are an efficient and cost effective products.
Method:
a) Clean the surface of all loose particles and moisten it.
b) Apply ready to use single pack bonding agent Polymer based chemicals by spray to as much area as can be plastered or gunnited in 60 minutes.
c) Wait for 10 to 15 minutes and provide a 'chat coat' of 1:3 cement mortar and then plaster as usual.
d) Cure the plaster as per usual practice.
Note:-
Do not provide neeru finish as the same can disturb the development bond between old and new concrete.
Important :
There are other situations where sticking of cement mortar on to old or new surfaces could be a problem, like in gunniting or Coating of M.S. Pipes.
Hack-Aid-Plast will solve the problem when used as a bonding coat. Rebound losses of material will also reduce.