Liquitex has a product called HIGH Permanent Gloss Varnish. Which of the GAC products is the equvilant?
The product sounds most similar to GOLDEN Polymer Medium. However, GAC 100 and GAC 500 may also be adequate substitutes. We noted on the label the High Gloss Varnish says for rigid supports only. This may be due to a harder, less tacky resin used. If a similar hardness is required from the GAC products, add in GAC 200, which is a very hard acrylic medium. The amount added would be dependent upon the required hardness, but generally start at a 1:1 mix with other paints and mediums.

I have hundreds of dollars worth of quality watercolors, but would like to not resolubilize while working. Which GAC product would you recommend to replace or amend the water used while painting, and would "glue" them down, yet keep their beauty?
You may find adding an acrylic medium like GAC 100 (we suggest trying first) will shock the watercolor paints because of the alkalinity of the acrylic. This could cause them to coagulate and become blotchy and uneven. Different brands react differently, so test the GAC 100 with your products and see what happens. You can thin the acrylic with water as needed, but after 30% water is added, the film begins to become less permanent. This isn't to say you cannot seal them off after the work is completed with a stronger coat of GAC 100 or thinned Soft Gel Gloss, but you want to be careful you don't have the resolubity problem you are trying to avoid.

Another alternative is to use GOLDEN Airbrush Transparent Extender as a fixative over the watercolor layers after they dry. Light spray coats can be carefully applied without disrupting the watercolor. If you do not have any airbrushes, you can use a really great device called a Preval® sprayer. This is a disposable aerosol can with a glass container you can fill with whatever you want to spray. It's used just like any other aerosol can. We recently bought one for $6.50. As you use the watercolors, GOLDEN Fluid Acrylics can be used for watercolor techniques and the permanency is built in. We are guessing you are heading in this direction, and are just looking to not take a loss on the watercolor paints you have already purchased.

What GAC product would I use if I want to make pours?
R3 The GAC 800 is the best medium for pouring. Mix it with the Fluid Acrylics, which have as much pigment as the Heavy Body Acrylics in tubes and jars, but are the consistency of heavy cream. We also suggest keeping the amount of color added to a minimum, which will decrease the chance of "crazing" developing as the pour dries. You have probably already seen this if you have done pours. It looks like a tiny riverbed in the thickest area of the pour. This happens when the film forms a skin on the surface, but there is still fluid material underneath. The skin shrinks as water evaporates and it tears until the entire film is dried.

Will the GAC 400 stiffen and tighten linen like rabbit skin glue?
In the testing performed with GAC 400 and linen, rabbit-skin glue (RSG) does seem to have a stiffer, more drum like quality than the GAC 400. We used to say the GAC 400 stiffens just like RSG, but after recent testing, we have found it stiffens, but it's not exactly like the RSG. In our testing, the GAC 400 seems to react much better with cotton canvas than linen, possibly due to the linen's natural oils (lignin we believe) repelling the action of the GAC 400.

Can I seal permanent marker signatures with GAC 900 to keep them from fading?
We think you have a good idea using GAC 900 over the permanent marker to prevent them from running, however, apply it thin and better yet, mix it with another acrylic medium, like GAC 100 (1:1) to make it a little less tacky.

We also suggest not using the permanent marker to sign your work if at all possible. A couple of options: mix GAC 900 with GOLDEN Airbrush Colors (1:1) and put into a refillable pen with a fiber nib. The look will be the same, but you'll have paint instead of India Ink.

You may also wish to make a silk-screen or template for your signature. Both are fairly easy to make and your signature will be very readable and permanent. You may also think of making a stamp and using the 1:1 mix as the ink.

When would I want to add Acrylic Flow Release?
GOLDEN Acrylic Flow Release (A.F.R.) is what is known as a surfactant, and its role in painting is to "make water wetter", by reducing its surface tension. As strange as it sounds, you do this everyday perhaps not even knowing it. Common household soaps, detergents, cleaning products and shampoos are all made with surfactants. This is the reason they clean so effectively, better than water alone. Sam Golden (our founder) first created this product for stain painting raw canvas. Artists would thin paints with water to create washes or stains and apply them to raw canvas. Cotton duck canvas resists water and makes it bead up on the surface. By adding 5-10% A.F.R. to the water, these stains will immediately penetrate into the canvas. Artists who like to thin their paints with water may experience better brush "flow" by adding A.F.R. to their water, even if they don't thin them down to a stain.