Most epoxy mixes are 2 to one resin and hardener. Or 4 or 5 or 6 to 1. Some companies offer 1:1 and push ease of mixing. But are they a good choice?
Melanie in the UK wrote to me. She has just bought an old Mirror dinghy and started sailing for the first time.Problem is that the boat leaks and she doesn’t want to stop using the boat until the end of the season.I have a philosophy of keeping older boats on the water and not pulling them off for months on end until you have the time to do the job.So the article here is useful to see what can be done with an old leaky plywood sailing dinghy to keep it going.It is perfect sailing weather at the moment in the UK and it is better she is out there learning but with the worst of the leaks gone.With a disciplined approach she should be able to get all of this done in a week or so. The general leaks fixed permanently and the rotted area reinforced so that the boat won’t break.
This is the second of my talks in the USA. It focuses a bit more on construction and some of the methods that can be used to keep a boat light and simple, but very strong and stiff.It also discusses how there is a “creep” in boatbuilding and design that increases the weight of boats way over what is really needed for a strong structure.
—gGluing Endgrain Gluing timber end grain with epoxySee drawing of endgrain right.. The basic problem is that end grain is highly absorbent so it can steal the resin from the join leaving insufficient for good bonding. The trick … is to feed the end grain some mixed resin before the glue mix is put on […]
There are huge advantages in keeping the epoxy at a slightly raised temperature. * It flows out better onto the work * It mixes easier * The curing kicks off faster in cold weather (and the box can easily only be turned on when needed. There are huge advantages in keeping the epoxy at a […]
There was the suggestion that very coarse sandpaper was the best to use on a timber surface to ensure good bonding when gluing or fiberglassing the surface. This is not recommended – the following explains why. There was the suggestion that very coarse sandpaper was the best to use on a timber surface to ensure […]
This is a problem most of use come up against at least once. However it is unlikely to happen a second time. Richard wrote to me asking why his epoxy was still soft 3 days later. He suggested it might be because of one of: 1. The immediate guess is that it’s been too cold […]
There are two tricks to sikaflexing between strips. Use the Sika Primer – it improves the bond strength to the timber for a permanent job. You can get away without it often, but it changes the situation from a fairly strong bond to a hugely strong bond (you’ll know this if you have ever removed […]
There are a number of labour and materials saving techniques that are applicable when using epoxy. Contents of this section Wet-on-Wet Coating and Dewaxing Cured Epoxy. Building strong lightweight boats – a note on the use of epoxy One Hit coating and gluing Wet-on-Wet Coating and Dewaxing Cured Epoxy. As epoxy cures some of the […]
Most quality boatbuilding epoxy manufacturers have a structural boatbuilding product. They normally are “high solids” boatbuilding epoxies that have uneven resin to hardener ratios (2:1, 3:1, 4:1 or 5:1) which you have to add powder to make a glue or filleting mix The same companies often produce pregelled products that are mixed in a 1:1 […]
One of the great leaps forward available to us when using epoxy is being able to eliminate fastenings (screws,nails, bolts etc) from the structure. Many builders now only use fasteners to temporarily hold things together while the glue sets up.The temporary fasteners are removed and can be re-used many times. Eliminating fastenings also speeds up […]
Big Hole in my Boat and More – a fast professional fix Fasteners in traditional construction are the ONLY way to go – whether metal or trunnel. But once moving over to glued construction there are certain advantages in eliminating the fasteners as far as possible. We’ve made a bit of a career of it […]
“Soaking” Epoxies – not so good Generally the thinners based products were a precursor to the full high solids epoxy catastrophe (and I mean that in the most positive sense). The most common in Oz is the dear old Epicraft Everdure which we all used to seal the insides and underdecks and often under […]