Author Topic: colored epoxies  (Read 1876 times)

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Offline nemul

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colored epoxies
« on: September 24, 2007, 02:52:58 AM »
i guess this would be materials? lol

what can be used to color epoxy.. like how Peak uses black epoxy where the battery contact is...
or do you have to buy it pre-colored?  right now i use the 2 part devcon..
nemul

Offline Trogan

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Re: colored epoxies
« Reply #1 on: September 24, 2007, 11:54:36 AM »
there was considerable discussion on colouring epoxies in the rodbuilding chatrooms a while back.
the reference was "marbellising" .
a number of pigments were available.
BTW - rodbuilding as in fishing rods.
Have not been there for a while ............ try this link
http://www.rodbuilding.org/library/marble.html

You can find some "universal" pigments for colouring fibreglass & epoxies in some boating shops................ the solvent used is apparently compatible with both fibreglass & epoxies................... but you need to be sure the pigment is of the "universal" type.
I have used this & it is OK too................ but I would recommend a testmix as essential  using minimum pigment for the colour effect ( max limits are typically
2 - 5% ) to check final hardness & adhesion properties, if you cannot source pigments specifically designed for epoxy.


Some time back when desperate for some black epoxy myself I dried out some black timber stain till it was very tacky and then added metholated spirits solvent to take up the last of the original solvent base and dried out till tacky again then added epoxy solvent & dried out again till I had a manageable viscosity for adding to the epoxy base before adding hardener.
    this is basically the way the pigment manufacturers shift their pigment  solutions around in commercial manufacture for use in different base mixes -ie  water base- enamel-polyurethane-fibreglass-epoxy etc , but they have the detailed knowledge of the compatible solvents as steps to get from A to B etc.
Took a little time but worked OK & the black epoxy produced is still as good as new.............. noting this was a cosmetic spray job & not an adhesive situation for components........... but my result still has perfect adhesion & the epoxy has been subjected to considerable flexing.

Offline Trogan

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Re: colored epoxies
« Reply #2 on: September 24, 2007, 12:33:52 PM »
Yo Flashaholics
Once you have used the above link to see what the rodaholics do with this stuff we need to start a bet going as to how long before a flashaholic posts a photo of a torch with this finish on it.............. it ain't gonna be me.
My bet
2 wks .......... for someone to get the gear together & make a presentable effort.
- would be rather neat for a G/F or missus light.

for anyone who wants to try you need a specialised ( but cheap) slow turning rod lathe or adapt a small rotisserie motor to hold & turn your torch, while the epoxy sets up & hardens before you start - otherwise the epoxy just runs to one side & the result is awful.
BTW make sure you put enough silicon grease on your threads so the epoxy does not get in there & carefully go around the joins pressing a very,very sharp 'stanley knife' to cut the epoxy at the joins when it has gone off but still soft........... that is the tricky bit for joins ............ don't try & cut the join when still tacky & its too late when it is hard ( as it usually chips in the cutting.)
Note: this is not a cutting/sawing action but a pressing of the blade into the soft epoxy around the joint.
Tip: put a bit of your epoxy on a board in a string an inch or so long about 1/4 ins wide at the same time you do your torch from the same epoxy mix & try cutting that first- when you think the time is right.............. when you dont stuff it up by trying too soon & it does not stick to the knife  .............. its time to count to ten - put some turps on the knife blade ( to stop the cut edges from bonding together again as it fully hardens)- hold your breath & attack the torch joins .

No cheating now
No sending your torch off to a 'rodaholic' to do it for you
Or to a pencilpen addict who does this stuff too.
Flashaholics honour system here !!!!!

Offline nemul

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Re: colored epoxies
« Reply #3 on: September 24, 2007, 10:49:45 PM »
great info!!!! thanks! that marbleizing looks cool!
nemul