If I politely may say so, I am not sure I agree with the original poster's statement that
CREATEX isn't the most forward about explaining their products. I think they are better than the average. Their Technical Data Sheets (TDS) are plenty and offer clear advice and the
Createx YouTube channel hosted by Chris Arpin is pretty good too.
I would suggest reading both to fully understand the roles played by
AutoBorne Sealers/Primers and
UVLS Clears within the Createx painting system. My interpretation of the information in both TDS documents is that fundamentally the difference lies in the main role each product was designed for. Whilst
AutoBorne is at heart a Primer/Sealer (thus a basecoat, foundational in properties and performance),
UVLS Clears are essentially and foremost a Top Coat, which is to say - with some creative license in so saying - a varnish.
However, whilst
UVLS Clears are chiefly top coats, one of them (Ref. 4050 - Gloss UVLS) can also be used as a Primer, thus taking on a basecoat role in specific circumstances, namely to:
- Prime metals, including polished metals and alloys such as brass and bronze, where the UVLS performs also as a corrosion inhibitor;
- Prime plastics, including styrene (model kits for example), polycarbonates and even 3D printing plastics and resinous plastics;
- Prime wood, where it performs as a typical solvent-based building sealer, filling the grain without raising it.
UVLS Ref. 4050 - Gloss has powerful adhesion characteristics, which is why it can be used as a Primer/Sealer. In this particular sense, it is similar in my view, to the characteristics of
AutoBorne Sealer/Primer Ref. 6000 - Transparent, which is the one with the most powerful adhesive properties of any sealer.
I think this shared characteristic (extremely powerful adhesion) is probably the reason why they can also be carriers:
- In the case of AutoBorne Sealer Code 6000 (transparent), it can be used as a carrier for Pearl and Metallic dry flakes (80% sealer to 20% dry flake);
- In the case of UVLS Clear Code 4050 (gloss), it can be used as a carrier for Createx Candy2O paint colours (aka jewel colours).
How all the above translates into real world situations is going to depend on a number of factors, but that is no different from what I used to say to Fine Art Oil Painting students 20 years ago. For example:
- Modellers working on plastic/styrene kits, which mean a fairly fragile substrate, should always wash the plastics with a powerful degreaser, such as automotive Bilt Hamber Surfex HD, then proceed with AutoBorne Primer/Sealer, leaving UVLS 4050 aside entirely as a basecoat;
- Artists working on stretched canvas might consider applying an acrylic professional artist grade gesso thinned to single-cream viscosity or even thinner than that (Lascaux, Golden and Liquitex probably the best three), flatten the gesso when bone dry to cut raised fibres and get a softer surface, then proceed with their painting without using CREATEX AutoBorne Primer which is designed for hard surfaces, so clearly it is not stable enough for flexible substrates such as stretched canvas;
- Artists working on canvas fixed onto a rigid panel (eg MDF or plywood), should first do the marouflage as it is often called in Artists Oil Painting, consisting in gluing the canvas to the rigid panel with an artist-grade glue, for example Lascaux Acrylic Adhesive 303 HV or Lascaux Acrylic Adhesive 498 HV, both archival/museum grade glues. Then proceed with a single-cream-like gesso (Lascaux, Golden or Liquitex), sand it lightly to flatten raised fibres, vacuum, then apply CREATEX AutoBorne Sealer, and proceed with painting the piece.
UVLS Clear top coats from CREATEX are
Permanent, which means they are not removable without causing disturbance to the painting underneath. This means UVLS Clears are fine for modellers, miniature painters and kit makers, but for artists whose intent is to preserve their artwork, UVLS Clears are
not suitable. An artists-grade top coat varnish is a better option, because artists-grade varnishes are designed to be removeable without causing damage to the paint film underneath, should it be necessary to carry out a repair or restoration work on a piece.