Above: Jim Derck describes how he used 410 Microlight in a metal door repair. Image: A knocker on a metal door. Photo by Felix Luo on Unsplash
At the end of moving day, after many large items had passed through the doorway, our house’s metal door was left with a nasty crease about a foot long. The door was made of steel and had a foam core. The needed repair was just a fairing application with no structural component. Continue reading →
If you are using the strip planking method to build a canoe, kayak or even a telescope, you already appreciate the beauty of wood. The following tips will help you achieve the clearest possible fiberglass coating to protect and reinforce the wood and show off your handiwork. Continue reading →
When replacing planking, often you have to drill a new hole through the wood and “hit” the existing hole on the frame (so as not to riddle the frame with new holes). This tool will help you properly locate the new hole. You can either modify a set of barbecue tongs to make this tool, or fashion one from strips of aluminum. Drill a hole in the blades. Attach a pointed stud to the lower blade. Continue reading →
It’s difficult to prevent cloth from lifting when fiberglassing around a sharp wooden corner. Even if you were able to lay glass tightly around a sharp corner, it could easily be dented. The slightest compression of the underlying wood could leave a void, and an invitation for moisture and the problems it creates. To avoid these problems, we always recommend rounding over the corner so the glass will lay flat against the surface. However, there may be times when you need a sharp corner. Here’s a method to make sharp fiberglass corners that are strong enough to prevent dents and protect the underlying wood. Continue reading →
Use one full pumps stroke of resin for each one full pump stroke of hardener to get the proper resin-to-hardener ratio.
If you’re ever concerned that your pumps aren’t metering properly, simply mix a test batch of 3 pump strokes each of resin and hardener. Stir thoroughly and make sure it’s fully cured before continuing with your project. Continue reading →
Our Technical Advisor Jim Derck (now retired), noticed that some fabrics seemed to have a remarkable thirst for epoxy. To determine exactly how much epoxy it takes to wet out and bond different kinds of fabric, Jim conducted a carefully controlled experiment. Continue reading →
Before beginning a project, it’s a good idea to test the adhesion between epoxy and the materials to be used. Preliminary adhesion tests can help you choose the best materials and surface preparation methods. It can also help to avoid a surprise bonding failure.
At Gougeon Brothers, Inc. we use a Pneumatic Adhesion Tensile Testing Instrument (PATTI) for adhesion tests. After the PATTI test stud is bonded to the test surface, the stud is pulled in tension until it releases. The instrument gauge gives a precise pounds per square inch reading at failure. Continue reading →
After living in our house for eight years and watching the ends of the threshold slowly deteriorate away and a few cracks and checks develop, I decided to replace the storm door, and figured now was a good time to restore the threshold. Continue reading →
Our 403 Microfibers and 405 Filleting Blend are excellent structural fillers but they’re fibrous and leave a rough surface when used to make fillets. To end up with a surface that is ready for coating or re-bonding without having to remove amine blush or sand smooth, apply a narrow strip of 879 Release Fabric after the fillet is made. Continue reading →
Why do centerboards and rudders need durable edges? When centerboards and flip-up rudders drag across the bottom, the first fiberglass to abrade away is usually the leading edge at the bottom. This exposes the end grain of the wood, allowing water to be absorbed the length of the centerboard or rudder. The wood then expands, cracking the fiberglass along the leading edge and causing more problems. When it is time to repair the tip, it usually takes a long time to dry the wood for an effective repair. Continue reading →