A Photo & Discussion Forum for Wharram Design Enthusiasts
oh finally, "secondary heat slump". Thanks. i've been looking for a way to describe what happens with East system that makes fillets so difficult. iv'e had to carry a small container of silica to thicken the epoxy. i am thinking of trying MAS for the rest of the boat.
I've used East (from Noah's in Toronto) and West, started out West for 50 gallons and really liked it then went to East based on reputation and price. Each have their strong points. West 206 is thicker and good for structural purposes, not so easy for wetting out cloth. East is great for wetting out cloth but I do have a problem with a secondary heat 'slump' when using it for structural fillets etc. Although I've not used it I understand West 207 is similar to the standard East resin.
No blush with the East resin which does save a bit of time and hassle. I have had pretty good amine blush on West finished panels, especially when pushed to cure with a heater in winter. Various hardeners available for both for different conditions and uses.
I'm moving my reply over here because it is in response to the epoxy issue.
I can't and there are probably many who can't express enough regard for Ann and Nev for their example in building and sailing a large catamaran many miles and continuiing to provide support for anyone who wants to go to sea in a Wharram. But the issue of epoxy allergy has been raised, and most of the epoxy manufactures never mention this.
MAS has been mentioned as a low allergic resin. It is important for any other resins that have or have not caused allergic reactions to be mentioned. I know I have some sensitivity to epoxy and will choose resins appropriately.
I hope Nev's sensitivity to epoxy doesn't translate to any other problems. It goes the same to any of us working with a boat with epoxy.
LUCKY YOU. Epoxy at 60usd a gallon. That is approx 45 euro. This is not what we pay here. For comparison I checked West on the net. for USA. In euros again about 60e. Best I found here. own-brand but marine to Lloyd's standard -112e. West system 160e. More than 2 1/2 times dearer !!! Seems where you buy is as important as which you buy. Now I understand better why so many on this site use West. My next boat I will build in Florida !!!
Ahoy Grumpy! er, Galway,
I had problems with WEST due to amine blush due to working outdoors in a boatyard with a deadline and chilly Fall weather. That was maybe 7 years ago. I tried a Florida epoxy called Raka (how appropriate) that guarranteed not to blush. I used it extensively to resheath my starboard hull and have been using ever since. I don't think it is non-allergenic though, but I wash with white vinegar, wear gloves, and I am merely irritated by epoxy, not having any dire reactions. Will it ever be done...
Still find it hard to believe these prices. So I did some more virtual shopping. Ebay UK still around 200 euro!!
This is approx 260 US dollars. For sure someone is getting ripped off.
This is enough to make even Snow White grumpy !!!
For solvent here I use cellulose thinners as used in spray-painting. Available cheap at any Auto Shop [ motor factors ] but NOT for washing hands !! Very good,makes brushes last a reasonable time. Someone mentioned Acetone on this site. This is only good for Polyester Resin[where it is very good] no good on Epoxy.
Best of luck - get back in the water soon there are too many Wharrams ashore !!