Sign in to follow this  
Followers 0
blackjack

Epoxy question???

19 posts in this topic

Got a scenario for ya guys!! If you are using an epoxy with a 1:1 mix and add additional hardener, will this make the epoxy brittle? Havent tried it yet but was wondering if anyone had

Share this post


Link to post
Share on other sites

Yep , that sounds right to me. I'm pretty sure anytime you make it cure quicker, it gets harder. There might be a point to where to much hardner will not let it cure properly.

Share this post


Link to post
Share on other sites

If there is a thermal reaction associated with the curing of the epoxy at some point if too much catalyst is used the heat generated adversely affects the epoxy. Fiberglass resin will spontanously combust if too much catalyst is used.

Share this post


Link to post
Share on other sites

BlackJack,

Sounds like you may be interested in speeding things up. Add to your drying wheel a heat lamp....I have done this and it cuts the drying time in half! You can buy a clip-on lamp near the auto-parts in Wal-Mart....bulb is about 4 dollars. Hehehehehehehe

Jed

Share this post


Link to post
Share on other sites

I already use the heat lamp trick!! Great idea it is killer for speeding things up some, What I am really looking for is to get the last coat of clear just a little harder than the initial coat. Kinda like musky proofing the lure. The clear I'm using is definetly a great finish just looking for a little bit harder and it will be perfect!! Thanks guys for the advice. I'm gonna try it on some of my personal lures before I get it into the production phase!!

Share this post


Link to post
Share on other sites

From what I have read on all types of epoxies, extra hardner does nothing. Most folks have tried extra hardner to get it to cure quicker. I never thought of it actually making the finish harder. But looking at allot of different sites for epoxies and reading the FAQ, manufacturers say that extra hardner serves no purpose except to waste hardner. The resin is where the toughness is. The hardner only heats it to cure it.

Skeeter

Share this post


Link to post
Share on other sites

Since some people here have trouble with Devcon yellowing and other's don't, is it possible that individuals that have the yellowing problem are adding too much catalyst and "over-cooking" the resin?

Share this post


Link to post
Share on other sites

It could be a possibility, but it is kinda hard to get the mixture wrong with the double syringe. A drop or two is not going to make a difference. I have experienced yellowing with the 5 min. epoxy. But in almost 4 yrs. I have never seen the long cure Devcon yellow. I really don't know how this could be happening to some.

Skeeter

Share this post


Link to post
Share on other sites

Hey fellas,

I think I may have stumbled onto an answer about the devcon 2ton yellowing.

I've attached a photo of one of my earlier lures that shows an area on the lure that yellowed. I shoot waterbased acrylic paint and topcoat with 2ton. The difference on this lure is that I brushed clear lacquer on the gill plates to fill in the crevices before topcoating. This was done to counter-act cratering. I allowed the clear lacquer to dry overnite before topcoating. The lure is about 6 months old and clearly shows yellowing where the lacquer was applied. I'm thinking devcon is not compatable with lacquer as all my acylic painted lures are still crystal clear.

Tight lines,

Shawn

devcon_discolor.jpg

devcon_discolor.jpg

devcon_discolor.jpg

devcon_discolor.jpg

devcon_discolor.jpg

devcon_discolor.jpg

devcon_discolor.jpg

devcon_discolor.jpg

775_thumb.attach

Share this post


Link to post
Share on other sites

Artbrush,

You may be on to some thing because back when I used Devcon, I was only using lacquer paints.

Glad some one with a camera , has gotten a photo of the yellowing up.

Was thinking you guys thought we were nuts, or conversly you guys were going color blind.hehehe

Share this post


Link to post
Share on other sites

Artbrush,

You may be on to some thing because back when I used Devcon, I was only using lacquer paints.

Glad some one with a camera , has gotten a photo of the yellowing up.

Was thinking you guys thought we were nuts, or conversly you guys were going color blind.hehehe

Share this post


Link to post
Share on other sites

I haven't brought this up as I don't want to get into the Devcon/Etex spat again but some of you might remember the Devcon bait I put in my truck window? Well, it's been more than 90 degrees here each day now for weeks and the bait is sitting directly in the sun. The bait has been there for about 6 weeks, maybe longer? The bait has a paper-photo finish and neither the paper or the Devcon have yellowed in the slightest way. I might add that a orange colored brochure I had sitting beside it was nearly white in two weeks!

I phoned Devcon several weeks ago and spoke with one of their techs. He explained from his experience that Devcon will yellow over time but that it would be very slight, not enough to destroy the bait. When I asked him "how long will the stuff last?", he told me it should last indefinitely as it essentially turns to a plastic once cured.

Jed

Share this post


Link to post
Share on other sites

I understand now, I never realised you were using a double syringe to meter the mixture, I agree that makes it rather difficult to add to much hardner. The lacquer yellowing makes sense to me and now there is evidence to the fact. Progress!!

Share this post


Link to post
Share on other sites

As usual I have to throw a wrench in the gears here. I shoot alot of acrylic lacquer and have yet to see yellowing. I see what you guys are talking about. That is some serious yellowing on the bait. I have never seen anything like it. What I am wondering is if the heat caused from the harder in the epoxy caused just the lacquer clear to yellow. I have never experienced problems with colors. The baits that I did over the winter with the Urathane Clear were clearcoated over with Devcon. I didn't sand or do any prep work at all. Just went over the Urathane coating with the Devcon and I have seen no yellowing as of yet. However, I have seen some separation of the Urathane from the paint. It still has not effected the Devcon in any way.

Skeeter

Share this post


Link to post
Share on other sites

Skeeter,

that might not be a wrench but perhaps a little closer to finding out why that's happening. I've only had the yellowing happen while working with clear nail lacquer. Sally Hansen's Hard as Nails. I'm not sure if thats enamel or acrylic based lacquer.

Tight lines,

Shawn

Share this post


Link to post
Share on other sites

That's wierd, because 10 yrs. ago I bought the same Hard as Nails to recoat some wraps on an old fishing rod. I also used it to coat an old Zara Spook that was painted with some acrylic pearl craft paint. I still have the lure and it has never chipped or yellowed in all of these years. I'm not sure what it is either, but most of this type of stuff that I have checked out is acrylic lacquer.

Skeeter

Share this post


Link to post
Share on other sites

There are different grades of lacquer, what is used on wood is not as clear as automotive and will darken with age regardless of uv exposure. The heat could play a role in the yellowing of the finish.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0