ChrisLBren

The Bitumen Experiment

35 posts in this topic

Captain Steve,

 

What is pleasant with these mixes, everyone can create a mix which suits his needs. I do not follow any ratios. I add bitumen till I am satisfied with the result on a test piece of wood.

 

In this case, 3 ingredients are involved; bitumen, tung oil and turpentine.

Bitumen and tung oil can be mixed together but it is easier if turpentine is used first to help to dissolve the bitumen.

 

Bitumen can be applied with or without the tung oil together or separately. Again,  testing is the answer.

 

When possible, I prefer 1 coat of tung oil. I have never tried by example 10 coats, but I suspect that there woul be a kind of brilliant finish with a certain thickness. Also I think that this finish could be  reflective to the camera flash. I prefer the look of 1 coat, because it has a more natural look without this plastic finish. This reflective surface was particuliary true with linseed oil teck oil which, I guess, are not as refine.

 

Chris,

 

when you say that it sort of acts like a wash in oil painting  this is true especially for the first coat but not so  true for the second coat depending of the drying tie between the 2 coats.

CaptainSteve and Bill Hime like this

Share this post


Link to post
Share on other sites

Hey Gaetan 

 

For me the trick of applying pure tung is to cut the first coat 50/50 with mineral spirits and then apply a second coat at full strength 24 hours later.  I found that the thinned first coat insured even absorption of the second coat.  Also much less seepage which is a tendency of pure tung. 

 

I am using Bitumen patina (which is a liquid) sold by art stores in Europe.  It sounds like you are using the solid form of Bitumen.  As far as the bitumen mix I've only used one coat thinned 50/50 with spirits after the tung is fully cured (a few days later) and it did go on like a wash.  I haven't attempted a second bitumen coat - I'm sure the ageing effect would be more pronounced.  

 

I am curious to see how the effect would change if mixed it directly in the tung oil instead of used as a top coat.  Ill have to try that one !

Chris

Edited by ChrisLBren

Share this post


Link to post
Share on other sites

To All;

I know this topic is a few years old, but what a great exchange of information! Thank you to ChrisLBren for starting it and maintaining the decorum that one should always expect at MSW!

 

 

Sincere Regards,

 

Bill

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