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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.
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 firstname.lastname@example.org.
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.