Monthly Archives: October 2013

Floor preparation

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Preparation prior to Industrial floor coatings.

If the floor has been painted before there can be areas of defective paint, flaking, cracking and blistering. The existing coating can break down due to fork lift traffic or being scraped and overused in areas, leaving visual imperfections. To paint straight over these imperfections will not produce a lasting finish as any new coating is only as strong as the one it is sitting upon. Two part paint systems offer very high adhesion, however still need thorough surface preparation prior to application to produce long term lifespans.
Mechanical grinding-
This method of floor preparation uses rotating diamond tips to scrape away existing coatings, leaving a sound surface with improved ‘key’. These diamond floor grinding machines can be sit on or walk behind and some have build in hoovers to remove the loose coatings produced by the grinding.

Sand blasting/shot blasting-
Another method to prepare the floor is by means of sand blasting & shot blasting, especially effective around obstacles. This method is not as fast as diamond grinding but more suitable if flooring is breaking up and delicate with lots of obstructions.

Removal of vinyl tiles-
There are machines available from most tool hire shops that will speed up this job. Once the tiles are up there is still glue residue to be removed, grinding should remove.

If the floor has grease residue present it will need cleaning prior to painting, sit on or push along machines are available from hire shops.

floor paintingThe preparation stage is most important and key to giving the floor coatings a long life span. Make sure not to cut corners in prep and cleaning and have a floor coating that lasts 30% longer.

Floor painting

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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.

floor grinding

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.