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Watco Oil Block Primer

Allows contaminated concrete floors to be painted

  • Two part epoxy primer
  • Seals in grease and oil and makes a good base for painting
  • Ideal for garage and workshops
  • Seals and binds weak, porous surfaces

Frequently bought together


Watco Oil Block Primer is a two part epoxy primer specially developed to aid adhesion to porous floor surfaces that cannot be thoroughly cleaned.

Recommended areas of use

  • Machine workshop floors
  • Factory floors
  • Warehouse floors
  • Garage floors


  • Suitable for concrete, brick and masonry, and it will also work on timber surfaces
  • Not suitable for use on non-porous, previously painted surfaces or metal surfaces
  • Not usually suitable for vegetable, animal or synthetic oil residues. It will tolerate slight dampness in the substrate

Free small liquid samples are available for trial purposes. It should be over coated with a suitable coating such as Watco Epoxy Gloss Coat.

Properties Specially developed to aid adhesion to porous floor surfaces that cannot be thoroughly cleaned.
Suitable for Bare, porous concrete
Interior or Exterior Interior
Composition 2 part, 100% solids epoxy resin
Coverage 16m² per 4L
Number of coats 1
Curing time 16 hours at 20°C
Minimum application temperature 10°C

Surface preparation

Remove as much oil as possible by scraping or grinding. Clean the surface with a degreasant such as Watco Concroff. It is important to rinse all traces of the cleaner away and allow the surface to dry. If using a solvent based cleaner, follow the supplier’s Instructions but, again, all traces should be removed before applying Watco Oil Block Primer.

The floor surface should preferably be dry, but slight traces of residual dampness can be tolerated. If preparing timber, use a suitable cleaner recommended for the purpose and follow the supplier’s Instructions.


Open the inner tins carefully and pour all of the contents of both the resin and curing agent tins into the clean, empty outer tin. Mix thoroughly with a wide bladed stirrer such as Watco Paint Mixer. Scrape the bottom and sides thoroughly to ensure no unmixed material remains. Decant the mixed product into another vessel (or a paint tray, if applying by roller) and apply to the prepared surface.


Do not apply at temperatures below 10°C. Apply one good coat of Oil Block Primer to the prepared surface and allow it to dry. Application by brush is preferable, because it allows the primer to be worked into the surface, but if applying by roller, use a medium pile roller, working it backwards and forwards to encourage penetration into the surface.

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£72.70 (Ex VAT)

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Tools and accessories

Paint Brush

Paint Brush

Professional paint brushes suitable for all coatings

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Watco Paint Mixer

Watco Paint Mixer

A manual mixer for thorough mixing of two-part coatings

£3.40  (Ex VAT)

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Everything you need to help with floor painting

From £45.30  (Ex VAT)

12" Roller Frame & Handle

12" Roller Frame & Handle

A sturdy roller applying floor coatings

From £8.50  (Ex VAT)

9" Roller & Tray with Spare Roller

9" Roller & Tray with Spare Roller

Medium pile roller and tray for applying floor and wall paints

£10.50  (Ex VAT)

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