Layup & Laminating™
Layup and Laminating™ Epoxy Resin was originally designed for ease of use in resin/fiberglass/composite construction. It is exceptionally durable in wood/fiberglass/epoxy composites. It was formulated to have a relatively low viscosity and special wetting agents to rapidly wet out fiberglass cloth. When used to wet out fiberglass, you will need approximately one ounce of Layup and Laminating Epoxy Resin (by weight) for each ounce (per yard) of fiberglass cloth. For example, one yard of 6 ounce fiberglass cloth will require 6 ounces (by weight) of Layup and Laminating Epoxy Resin to wet out properly. A gallon of L&L Resin will wet out 10 square yards (8 sq. m.) of 6 ounce fiberglass cloth. We have found it to be an ideal follow-up resin for wood repair, either as a brush on or poured/pumped into cavities previously saturated with Clear Penetrating Epoxy Sealer™.
Layup and Laminating Epoxy Resin can also be used as a general purpose adhesive. Normal coverage when using as an adhesive is approximately 45 sq. ft. per gallon at 1/32" (4.1 sq. m. per 3.8 liters at 0.8 mm.). This is the minimum recommended amount to get a strong glue joint. Any less, and there is a risk of not having enough glue in the joint, commonly referred to as "starving the joint". When bonding rough surfaces it is often necessary to use twice as much glue or more to avoid starving the joint. In these cases, coverage will be reduced by half or more. When clamping glue joints, be careful not to over-tighten the clamps.
Mixing & Application Techniques
While we primarily use L & L Resin to repair rotted wood, it is an excellent fiberglassing resin as well. L & L Resin will wet out fiberglass cloth at the rate of one ounce of resin (by weight) for every ounce (per yard) of fiberglass cloth. For example, one yard of one ounce fiberglass cloth would take one ounce (by weight) of epoxy resin to wet out properly. By volume, this equals approximately two ounces of L & L Resin per ounce (by weight) of fiberglass cloth. A gallon of L & L Resin will wet out 10 square yards (8 sq. m.) of 6 ounce fiberglass cloth.
NOTE: Bulk mixing (more than two quarts at one time) is not advised. It makes a thorough mix more difficult, and it concentrates more resin in one location which will generate induction heat and further accelerate the set time.
Mixed viscosity is 1000 centipoise at 72° F (22° C), comparable to other low viscosity epoxy systems. At 72° F (22° C) the pot life is 1 hour, the thin-film set time is 4 hours, and the time to fully cure will be about 1-2 days. At 55° F (13° C) full cure will be about 2-4 days.
NOTE: For application into tight areas, we prefer to use our Re-useable Poly Caulking Tubes. You fill the tube with L & L Resin, with or without a thickener, put the plunger in and load into a standard caulk gun. After cutting the tip to the size required, squeeze the L & L Resin into place. These empty 10 oz caulking tubes are for sale on our order form as part number 117. Customers have also reported good results with hand-crank transmission oil pumps purchased from your local automotive supplier. Designed to pump thick fluids, and cheap enough to be considered disposable, we feel that they would work fine.
Layup & Laminating Epoxy Resin is often used as a filler or a pourable slurry for voids in wood, fiberglass or concrete. Sawdust, milled/chopped fiberglass and fumed silica (Cab-O-Sil®) are all good general purpose products which can all be added to the resin as thickeners. The more you add the thicker the mix. When adding thickener, it's important that the Layup & Laminating Epoxy Resin be thoroughly mixed BEFORE the thickener is added. The thickener is then added slowly while stirring the mixed resin until the desired consistency is reached.
Some useful information from The Rot Doctor . . .
That said, let's now look at epoxy resins. Each manufacturer/distributor/formulator discusses their particular resins, activator ratios, thickness or thinness, blushing effects, etc.-- and how much resin you're getting for your dollar. All very interesting. But what about the virgin resin itself? Where does that come from? And does it make a difference?
Approximately 75% of all virgin epoxy resin sold in the U.S. comes from three manufacturers: Shell, Dow and Ciba-Geigy. Only Ciba-Geigy is not back-integrated. These resins are almost always petroleum-based resins (oil, natural gas) and are in turn sold to manufacturer-distributors, such as WEST. They can be "doctored" to some extent, bottled/drummed and sold with activators of various intensities. Price is critical because most epoxy resin in the marine market goes to manufacturers, shops and yards--and we know all about that.
Layup and Laminating Epoxy Resin is a hazardous product. Check the shipping options on the order form for details on shipping hazardous items. For additional information, refer to the Layup and Laminating Epoxy Resin Safety Data Sheet.
The Rot Doctor, Inc.
P.O. Box 30612 • Seattle, WA 98113
Voice: 206.364.2155 • Fax: 206.364.4744
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