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Q. Use of primers in joint sealant?
Most of the joint sealants applied in concrete joints are adhesive and recommended joint width/depth of joint sealant is from 2:1 to 1:1 as given by BS6213 and Guide to Selection of Constructional Sealants. When joint sealant is applied on top of joint filler in concrete joints, extra primers are sometimes essential since:
(i) Primers help to seal surface to stop chemical reaction with water;
(ii) It gives a suitable surface for adhesion of joint sealant.
Fig: Primer in joints
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