MITRA Forum Question Details

EditDeleteAs you mention damar (or dammar), I am assuming that you are talking about varnishing oil, artist's alkyd, or acrylic dispersion paintings. The glossiest varnish generally approved by the conservation community for these paint systems is based on Regalrez 1094. It is sold as a dry resin from conservation suppliers and as a solution (often under proprietary names) by a few artists and conservation materials suppliers (eg Gamvar, UVS Finishing varnish, and others). A few coats of this on a well dried painting will create a very wet and glossy surface, no burnishing required. Others will work but Regalrez is glossier. The other really nice thing about Regalrez 1094 is that it is soluble and reversible in very low polarity solvents (eg odorless mineral spirits) meaning that if your work ever needs to be conserved in the future, the varnish can be reduced or removed in solvents that are unlikely to affect your original paint as long as you are following sound painting practices (compatible media, sensible layering, adequate dry times, etc)

EditDeleteYes Arkon P-90 is a fairly glossy, low molecular weight varnish that has been used in conservation. When compared to Regalrez (at least based on artificial aging tests) it does appear to require more polar (stronger) solvents to remove after a period of time and requiresTinuvin 292 or some hindered amine light stabilizer added to counteract potential yellowing. According to research carried out by conservation scientist Rene de la Rie and others in the early 90s it is not as "stable" as Regalrez. It does not sound like a terrible product by any means; however, when Regalrez was formulated it more or less superseded the need to use Arkon P-90 as Regalrez appears to have generated better results when subjected to the same range of tests. You can read more about all of this information on the American Institute for Conservation's Paintings Specialty Group Wiki that focuses on varnishes here: http://www.conservation-wiki.com/wiki/IV._Low_Molecular_Weight_Varnishes

EditDeleteI would also add that Gamblin has some nice videos and tips relating to varnishing with Regalrez (otherwise known as Gamvar) on their website that may be of some interest.