 Fiberglass and epoxy questions, Paul or anybody w/experience?, I've done research but there are varying answers... |
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| neo914-6 |
  Sep 3 2006, 02:14 PM
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neo life  Group: Members Posts: 5,086 Joined: 16-January 03 From: Willow Glen (San Jose) Member No.: 159  |
I'm working with TAP marine epoxy resin and various weights of mostly fiberglass cloth material. TAP is great but you have to find the experienced guy (like Home Depot or OSH) for good information.
I chose epoxy because it's odorless (CA neighbor friendly) and has good bonding strength. It requires more precise mixing ratios as I've found out the hard way. The questions Is the 914 top covered with a gelcoat? Does epoxy bond well to gelcoat? How long should you wait between laying the next layer of cloth? If more than 24 hours do you need to sand the surface for the next layer? Is there a water soluable layer you need to wash off or you may have delamination later? (IMG:style_emoticons/default/confused24.gif) |
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| swl |
Sep 3 2006, 02:38 PM
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Senior Member Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada |
Dunno anything about TAP. I used East system when I built my kayak. Most epoxy resins are similar but ymmv amongst brands. You seem to have the right info:
1. Next coat is a timed affair. In order to get a chemical bond between coats (instead of just a mechanical one) you want the undercoat to be set but not hard. The boat building guys talk about the thumbnail test. If you can press moderately with your thumbnail and not see a dent then you are ready for the next coat. The set time is sensitive to temp so it varies. With East system it was about 6 hours iirc. Makes 4 coats a marathon. 2. If you can't get the next coat on before it is hard then you have to sand it to get a good mechanical bond. I 3. Most (but not all) epoxy systems have something called an amine (sp?) blush. It is a (slightly) greasy residue from the reaction. It is normally washed off with water and vinegar I think. East doesn't blush so I didn't have to worry about it. Bonding is an interesting question - don't have a clue what the best surface would be. This is going to be a mechanical bond so you are just sticking it on. Here's a link to a good boatbuilding board - there are a lot fiberglass guru's hanging out there. http://bearmountainboats.com/phpbb2/index.php |
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Posts in this topic
neo914-6 Fiberglass and epoxy questions, Paul or anybody w/experience? Sep 3 2006, 02:14 PM
JPB Well bro, epoxy MUST be laminated in timely interv... Sep 3 2006, 03:55 PM neo914-6 thanks guys!
I'm thinking of using Carb... Sep 3 2006, 04:35 PM swl As long as the resin is sanded you should get a go... Sep 3 2006, 08:18 PM swl oh - btw. Lots of people are alergic to green epo... Sep 3 2006, 08:27 PM
alpha434 Make sure you have a really good look at the whole... Sep 3 2006, 08:46 PM |
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