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SML SHIELD - Premium Yacht Primers

The SHIELD range are commercial primers formulated for easy application by leisure users who do not have access to spray equipment and are available in smaller 2.5 litre tins.
For all metal - Use ST Epoxy Primer which bonds well to bare metal but is tolerant of less than perfect preparation, then High Build Epoxy to increase the thickness of the protective layer. Use Quick-Dry Spot Primer, in a handy 500ml, tin to prime small areas of bare metal before applying a single-pack topcoat.
For bare GRP - Apply High Build Epoxy to repair and build up the GRP/gelcoat layer, easily sanded to provide a smooth finish ready for your topcoat.
For previously painted surfaces - Use Undercoat above the waterline and Underwater Primer below to form a good base for your topcoat or antifouling.


Fast-drying bilge paint, primer/finish coat, to protect steel & GRP, & giving excellent water, diesel and chemical resistance. Easy application to all types of bilge including Yachts and Canal Boat.

From £28.30

100's OF

A 2-pack high build epoxy primer for use above or below the waterline, or as a build coat over Shield Surface Tolerant Epoxy Primer.

From £39.95

A handy quick-dry spot primer which can be applied direct to steel for touch-up repairs. Same day over-coating.

From £10.20

A surface tolerant epoxy primer for use on steel above and below the waterline. Use as a first coat on prepared steel.

From £32.95

100's OF

A single pack primer with good adhesion to steel, aluminium and wood. Can be used as a matt topcoat. 2.5L pack size.

From £28.55


SHIELD Underwater Primer is a specially formulated primer for use below the waterline under CU-PRO Premium Antifouling. It can also be used to seal over existing antifouling or direct to GRP, aluminum, steel, wood or ferro cement.

From £28.55

General primer information

It is important to select the right primer for the substrate you are applying it to and you should be able to get a good idea if you read the category headings. As a general rule primers intended to protect metal from rust and GRP from osmosis are applied in a number of coats to form a thick water resistant layer – two-pack high build epoxies provide excellent protection. Surface preparation is important and the amount of time you are willing to take will affect the choices of primer you will be able to use and the success of the paint system as a whole. Surface tolerant primers can make preparation easier for metal substrates.

If you are applying a primer over an existing paint coating you will be more limited in your choices as the new paint could react with the old. In this case, regardless, the success of the eventual coating will always come back to what you are painting over. Generally two pack primers will not go on top of single pack coatings, however single pack primers can go over prepared two pack coatings. If you are unsure of what you are painting over we can provide a FREE test kit. We supply single pack primers that provide a good ‘tie coat’ between existing coatings and seal old antifouling and undercoats that build the colour before applying the topcoat.

Because they are thicker than topcoats, if you intend to spray, the majority of our marine primers require airless spray equipment. An airless sprayer is different from a conventional paint sprayer as it pumps the paint through a nozzle rather than blow it out using compressed air.

If you need help choosing a primer you can send us a message, with as much detail of your project as possible, using the message system below or send us an email at

P.S. Don’t forget the personal protection equipmet and accessories such as paint brushes, rollers, trays, and scuttles. We recommend our Blue Stripe Rollers for applying primers. All of our accessories have been tried and tested and are solvent resistant – not something you can guarantee with DIY store application products.


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