Know How: Epoxy Resin in a Caulking Gun

Like all owners of older boats who like to do their own work, I’m extremely familiar with epoxy resin. I reckon I’ve used a good few gallons of it, for both major projects and little jobs where only small amounts are needed.
Author:
Publish date:
Updated on
epoxytop

I used the larger Flexpoxy dispenser—ideal for bigger projects. The smaller cartridge that fits in a standard caulking gun should suit most needs

Like all owners of older boats who like to do their own work, I’m extremely familiar with epoxy resin. I reckon I’ve used a good few gallons of it, for both major projects and little jobs where only small amounts are needed.

It’s for these latter tasks—sometimes involving no more than filling a few screw holes or bonding together small pieces of wood or fiberglass—that I’ve often cursed the need to get out the two cans of resin and hardener and mixing the required amounts. I’ve usually ended up with more resin than I can use, and that stuff’s too expensive to waste. Also, the epoxy invariably needs to be thickened so that it stays put, fills gaps, doesn’t sag and generally behaves itself the way you want it to.

This is what “thixotropic” means!

This is what “thixotropic” means!

Which is why I’m a total convert to Pettit’s Flexpoxy and WEST SYSTEM’s Six10 epoxies. These are both two-part epoxies that come in cartridges that fit in caulking guns; you just squeeze out as little or as much as you need, and mix the two parts together with a spatula. Six10 comes with a static mixer tip that dispenses the epoxy premixed, a good idea if you’re going to be using a lot of it at one time.

Both are extremely thixotropic, a ten-dollar word that means they won’t sag. This makes them ideal for overhead and vertical surfaces.

Six10 in action with its mixing tip, filling holes in a deck

Six10 in action with its mixing tip, filling holes in a deck

Having used these products extensively, I can recommend both of them. They’re described as “gap filling, structural epoxies.” I used the Flexpoxy when filling and fairing my cockpit prior to painting it, and for underwater fiberglass repairs. Most recently, the Six10 came in handy for filling a couple of dozen 5/16in bolt holes after I removed the beat-up old genoa sheet tracks—I applied masking tape under the deck, reamed out the holes with a slightly bigger drill bit to get rid of old caulking, and squirted the Six10 into them. A job that would have taken ages the oldfashioned way was accomplished in a few minutes.

Both products retain some flexibility when cured, and can be used above and below the waterline on fiberglass, wood, steel, aluminum and just about any other substance you’ll find on a boat. They’ll last for a year or more.

Related

01-Lead-show

France’s Annual Multihull Show

If a boat show could be described as intimate, the annual Salon International du Multicoque in La Grande Motte, on France’s Mediterranean coast, is it. Held in the latter part of April, the multihulls-only in-water show is a boon for builders, because the people who attend come ...read more

TOTW_PromoSite

SAIL's Tip of the Week

Presented by Vetus-Maxwell. Got a tip? Send it to sailmail@sailmagazine.com Check the waypoint  Most errors with GPS and paper chart navigation are caused by the operator punching in the wrong numbers or plotting the lat/long incorrectly. The surest way to double-check a ...read more

Furlex-Electric

Gear: Seldén’s Furlex Electric

Furl Power Seldén’s Furlex Electric offers an easy path into the world of sweat-free headsail furling. The compact unit can be retrofitted to an existing manual Furlex unit or installed as a replacement for whatever you’ve got now. Its DC-DC converter accepts your boat’s 12V or ...read more

11_DSC8423Tom-Zydler

Cruising: Nova Scotia

There’s a unique cruising ground that combines access to urban locations with easy escapes to wilderness and nature. Its native people may be the friendliest on the east coast of North America. Its coastline runs 250 nautical miles in a straight line, but that should be ...read more

01-LEAD-shutterstock_727849660

Boat Monitoring System

Boat Oversight In a world where you can track your friends’ locations in real time and stream yourself live on the internet, it should come as no surprise that you can also keep a close eye on your boat from the comfort of home. In fact, not only is there a plethora of options ...read more

pilot_saloon_42-_en_navigation_11

Boat Review: Wauquiez Pilot Saloon 42

Old salts grouse about modern aesthetics. It’s just what they do, and the hard lines and spartan interiors of today’s production boats give them many reasons to complain. French builder Wauquiez, however, seems to consistently be able to marry contemporary elements with ...read more