Surface preparation for paint for PRO-SET® epoxy

PRO-SET epoxies provide an excellent base for most paint systems. However, you will need to prepare the surface thoroughly to ensure that the paint will adhere properly and give a smooth finish.

Linear polyurethane paints have proven to be the most durable protection over epoxy. Regardless of the paint system used, thorough preparation of the surface is essential for good paint adhesion and a smooth finish. For coating, follow the paint manufacturer’s instructions.

Wet-sand the surface to remove any flaws and provide a texture for the paint to key into. If you are using a filling or sandable primer, use 100 grit paper. Use 220-320 grit paper if no primer is used. The thinner the paint film thickness, the finer the grit of sandpaper needed.

Rinse the surface with clean water and dry thoroughly. The rinsed surface should not bead or fish-eye. Both of those phenomena could be a sign of local contamination. Re-wash the surface with solvent if necessary and wet-sand. Allow the surface to dry thoroughly before you start painting.

 

 

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Preparation with release fabric 
Another surface preparation technique you may need to use is preparation with release fabric. If you are going to add another coating on top of the lay-up, place a release fabric over the surface first to get a finely textured, contaminate-free finish. Find out more here.

Preparation for secondary bonding
The success of secondary bonding depends not only on the strength of the epoxy, but also on the ability of the epoxy to mechanically key into the surface of the material. Learn more about special surface preparation techniques for secondary bonding on this page.

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