A Little bit about Finishing

niagra

 

In my last blog post, I mentioned that I was planning to switch from my tried and true solvent based lacquer finish to a more eco friendly water based finish. A reader commented on the switch, and this lead me to jot down some thoughts I have been having on this issue…well…and as another excuse to avoid working on  The Madcap Woodwright-Thoughts On Joyfully Working Wood With Abandon manuscript.

As the Muse has continued to elude me of late, I figured that writing ANYTHING was better than hiding from my ThinkPad. (A true hot rod of a laptop by the way)

As I mentioned, my normal film finish (as opposed to a penetrating finish like Danish oil) was always some version of a traditional lacquer finish. Nitrocellulose, or “pre catalyzed” lacquer being the two main versions most commonly used, until recent changes to environmental law began making finding reliable and affordable sources for these finishes difficult.

In addition, I have many, many, MANY years under my belt using these finishes. They are wonderful, and provide a good protective, and visually pleasing finish. Ease of use and over all versatility round out the reasons why they are traditionally preferred finish choice.

Their downsides, for me at least, include toxic vapor, flammable vapor, environmentally negative, and they require specialized EXPLOSION PROOF exhaust equipment to be anywhere near compliant with safety regulations in most areas.

Enter water based finishes.

Since their initial introduction, some 15(?) plus years ago, they developed a reputation for being cranky, finicky, and generally not ready for prime time.

A lot has changed in that time.

Now, let me say here, I have yet to actually use a waterborne finish. To say that I am hopeful, yet skeptical, would be an apt description.

However, word on the street among those who have actually used these finishes, say that they act very much like their solvent based predecessors. The word is that the newest generations of waterborne finishes cure to a tough, hard, and nearly identical to the traditional lacquers they are moving to replace.

target finishes

One thing to note, ANY solvent free finish that calls itself  “Lacquer”, is NOT lacquer in the strictest sense. Rather, most water based lacquers are in fact an ACRYLIC rather than a true lacquer. This is important because it has some significant differences in performance. Acrylic finishes are difficult to strip off when doing a refinish as compared to traditional lacquer, it does not “move” in the same way a traditional lacquer does either. This is, or could be important, for instrument makers or craftsman who take wood movement into consideration.

That said, the latest generations of acrylic lacquers are said to have much improved elasticity properties, and  perform very, very closely to solvent based lacquers but tends to be brand dependent.

All of this leads me to the decision to begin working with the above pictured finish. By all accounts the Target Coatings acrylic lacquer is as close to traditional lacquer as one can get in the latest generation of waterborne finishes.

My hope is that I will find that this is the case. I really want to be able to make the switch from solvent based to water based spray-able finishes.

Much more on this as events unfold……stay tuned.

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