Hempel Internal Document
521 Uncoated steel – manual cleaning
1. Oil and grease: Remove. 2. Corrosion, loose scale, welding slag and spatter: Remove. 3. Residual rust: Treat with a proprietary removal solution. 4. Primer: Apply as soon as possible.
541 Uncoated aluminium/ copper/ lead
1. Surface corrosion: Remove and lightly key surface. 2. Pretreatment: Etching primer if recommended by coating system manufacturer.
552 Uncoated PVC-U
1. Dirt and grease: Remove. Do not abrade surface.
552A
Uncoated PVC-U
1. Dirt and grease: Remove. Clean using Sandtex Trade PVC-u Cleaner
552B
Painted PVC-U
1. Dirt and grease: Remove. Clean PVC-u using Sandtex Trade PVC-u Cleaner
560 Uncoated concrete
1. Release agents: Remove.
560A
Uncoated concrete
1. Release agents: Remove. 2. Prepare any weak or power floated concrete surfaces by either acid etching or vacuum grit blasting (Blastrac)
3. Care must be taken to minimise surface profile during preparation 4. NOTE: Acid etching will be ineffective on chemically sealed surfaces
570 Uncoated masonry/ Rendering
1. Loose and flaking material: remove.
580 Uncoated plaster
1. Nibs, trowel marks and plaster splashes: Scrape off. 2. Overtrowelled ‘polished’ areas: Key lightly.
590 Uncoated plasterboard
1. Depressions around fixings: Fill with stoppers/ fillers
622 Organic growths
1. Dead and loose growths and infected coatings: Scrape off and remove from site. 2. Treatment biocide: Apply appropriate solution to growth areas and surrounding surfaces. 3. Residual effect biocide: Apply appropriate solution to inhibit re-establishment of growths.
631 Previously painted window frames
1. Paint encroaching beyond glass sight line: Remove. 2. Loose and defective putty: Remove.
Crown Trade 23-05-2024
M60 Painting/clear finishing Page 88 of 91
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