The most important factor in application of floor coatings is the surface preparation prior to any floor painting.
In the case of previously painted surfaces that are in good condition it is important to thoroughly clean and de grease the floor. This will ensure the floor paint can adhere to the surface, if painting over rubber or grease residue the adhesion won’t be sufficient and the paint will ‘bead up’ an effect where unpainted circular patches are visible. If the floor is small it can be mopped 2-3 times by hand with a cleaning agent to get it ready for the new coating. If the floor area is very large specialist cleaning machines can be hired to spped up the process. Once ready for painting it is a good idea to perform several test patches, leave for 10 minutes and ensure the paint is drying to an acceptable finish. If any ‘beading effect’ is present it will need further cleaning.
For minor imperfections a high build floor primer will level and minimise before the top coat.
New concrete screeds
If painting over a new concrete screed it is important to give the new floor time to dry sufficiently. A new 50mm screed can take approx 2 months to dry, this rate can be sped up by heating the industrial unit. There are specialist floor coatings available that can go over a new screed after 7 days, such as Rawlins Duraplus, a two part water based floor paint.
Removing defective coatings
Old floors will usually have defective, blistered and cracking paint. For large areas the most practical way to remove these defective coatings is by mechanical grinding. The grinders work with diamond tipped plates to remove any loose paint and provide a sound surface to paint over.
Repairs to large imperfections
Old floors often have large imperfections that will need attention prior to painting. There are specialist mortar repair products on the market to fill these imperfections or a sand and cement screed can be used.
Guarantee/warranty of the new coating
Floor paint manufacturers don’t give a warranty on their products but instead give an expected lifespan of the product. The floor painting contractor will usually give a warranty of 12-24 months for the job, ensure to ask before going ahead with the quotation.