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Forum topic by willhime posted 05-22-2018 12:50 AM 506 views 0 times favorited 4 replies Add to Favorites Watch
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willhime

122 posts in 1683 days


05-22-2018 12:50 AM

Topic tags/keywords: question resource tip trick finishing

I’ve been doing epoxy fills for a couple years now and it just dawned on me to even research quality differences. I figured epoxy was epoxy but I have a suspension I might be wrong. I’ve just been using the Home Depot stuff that says it’s 60 coats in 1. Am I wasting my money buying that or sacrificing quality ? I saw that Goebel furniture uses the West system pump type brand. I wondered if it’s because it’s awesome or is he just sponsored by that ?

-- Burn your fire for no witness


4 replies so far

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bondogaposis

4986 posts in 2495 days


#1 posted 05-22-2018 12:55 AM

If you want good epoxy go to the boat building suppliers.

-- Bondo Gaposis

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dca

27 posts in 169 days


#2 posted 05-22-2018 01:20 AM

Bondo is correct – boat builders know their stuff.

West Systems gets very high marks from what I’ve heard.
I’ve use System Three Epoxy for a couple of reasons:

1. I called them up and an engineer walked me through my application and let me know precisely what I needed to buy. This is more important than you think. Primarily this relates to hardeners – how wide/deep is the gap that you’re trying to fill and what are your ambient temperatures, etc.

2. It’s slightly less expensive and I can get it in two days via Amazon Prime.

3. The main difference was the mixing ratio. 2 parts resin to 1 part hardener. I believe West Systems has a slightly different ratio that relies on a number of pumps. I like that I can have three plastic cups and fill them to equal measure and have a working ratio.

In the future I’m going to give West Systems a try as well – but I have no complaints about System Three. I came to them after trying to use Bondo Fiberglass Resin – wow, what a disaster. You can spent a lot of money trying to save a buck. That said if what you’re using works, then it works. Epoxy is a fairly old technology.

Also, I’ve been using a half dozen drops of waterproof fountain pen ink to dye the epoxy – has worked well for me so far. Best of luck.

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MrUnix

6928 posts in 2343 days


#3 posted 05-22-2018 01:50 AM

3. The main difference was the mixing ratio. 2 parts resin to 1 part hardener. I believe West Systems has a slightly different ratio that relies on a number of pumps. I like that I can have three plastic cups and fill them to equal measure and have a working ratio.
- dca

Mixing ratios are all over the map between various epoxies. West System is 5:1 for the regular hardeners, and 3.5:1 for the clear (207) and extra slow (209) hardeners, and it can be measured based on either volume or weight. The pump system just makes it easier to dispense without having to think about it (1 pump resin to 1 pump hardener). I frequently mix up very small amounts, using those little 1oz Solo cups, which is way too small for the pumps. It’s pretty easy to just throw it on a gram scale and squirt out the proper ratio based on weight though (ie: 10 grams resin and 2 grams hardener).

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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John Smith

1367 posts in 306 days


#4 posted 05-22-2018 01:59 AM

if you spend some time at www.woodenboat.com you will see that epoxy
is the same hot topic there as a good furniture finish is here on LJ.
those guys build or repair boats that are meant to last several generations.
for the hobbyist, it depends on what you are using epoxy for and your vision
of endurance and longevity. (and your budget for the “good stuff”).

.

-- I started out with nothing in life ~ and still have most of it left.

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