TotalBoat TotalProtect Epoxy Barrier Coat System High build two part epoxy primer and barrier coat for use above and below the waterline Excellent for gelcoat blister prevention and repair work on fiberglass boats Provides superior corrosion protection on all underwater metals Easy to mix and apply by roller or spray. No sanding required. Fast drying primer creates a flexible, durable epoxy barrier coat. Available in your choice of White or Gray in Quart or Gallon size kit. &#034;This was used on a repaired keel. First, I stripped all the paint, repaired the keel, then used this to barrier coat the entire keel. I used primarily rollers but needed a brush for some details. It dried quickly even in our cool weather.&#034; <span class="a-text-italic">- ld75, via Amazon Reviews</span> &#034;This epoxy primer worked great. Sprayed it using a 2.5mm tip and it layed out nice. Very thick material.&#034;<span class="a-text-italic"> - Nate, via Amazon Reviews</span>