By Tom Pawlak — GBI Technical Advisor
There are many ways to machine scarf bevels on plywood panels. The best method depends on how many scarf joints your project requires. If you need to scarf only two sheets of 3mm plywood, using a block plane and sanding block is a good low cost option. If you have a daily need to scarf many panels, a reliable machining method is a wise investment. This article reviews several popular scarffing methods and tools, to help you decide which is best for you. Continue reading
This article about epoxy and oak was originally published in early 1995, and is shared at Epoxyworks.com for historical purposes. A dozen years after this article was written, we developed G/flex epoxies, which are rubber toughened to withstand shock, vibration, expansion and contraction. G/flex epoxies adhere tenaciously to many difficult to bond substrates, including dense and oily wood species like oak. Continue reading
By Jim Derck
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
by Jim Derck
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
Strategies for successful application and curing of epoxy at low temperatures
Epoxy behaves differently in cold temperatures. These handling tips can guide you in obtaining optimum performance from epoxy in this fall and winter.
Epoxies reach a higher percentage of their potential physical properties when mixed and applied at temperatures above 60°F. However, you can use epoxy at lower temperatures and still obtain a dependable bond. The key is adapting your handling and application techniques to cold temperatures. Whether you live in a Northern or Southern climate, it is helpful to know how temperature affects epoxy chemistry, how epoxy handles differently in cold conditions, and what steps you can take to assure dependable bonds in cold weather. Continue reading