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Claudemir, the common objections of cost, and expenditures of time (better spendi it painting, instead of making supports) are certainly valid.
Anyone who preps their own supports simply to save money is definitely barking up the wrong tree, but I assure you that for my own purposes, neither Claessens nor Fredrix provide what I make up in my own studio. As they say on TV, "Not sold in stores!!"How important is that ? Not very in the long haul, probably, but it assuages my need to be totally in control of the process.
The unfortunate thing is that discussing the process online is bound to annoy some folks who prefer certain approaches or materials over others, and will not be thoroughly helpful to those trying to learn how, because although it's not rocket science, it's involved enough that the only good way to instruct a sound method for stretching and priming canvas is to see it done beginning to end.
Thomasin, the variables you indicate make it a real problem to answer your questions. That said, making the linen "drum tight" is not the purpose of sizing, and glue in too heavy a concentration, improperly applied is likely to cause problems. Not having ever used a microwave to warm glue size, I can only speculate that as microwave is known to change the consistency and character of many foods, it may or may not be advisable to use making glue.
Tensioning of the fabric through shrinking or stretching is an issue entirely aside from sizing. Coating or saturating the fabric with a heavy concentration of glue size is inadvisable. Think of the glue as being like a sheet of glass between the paint (and its oils) and the fabric. It is a barrier. The half-strength "drink" is applied to make it so a full-strength application will not saturate the linen, but remain on the painting surface as a barrier coating. One application is adequate if properly applied.
Now I'm confused. "PVC" may be understood to stand for Poly Vinyl Chloride, which is a plastic. House paints of any species have no place in the preparation of a fine-art painting support.
If you intend to use a water-reducible acrylic co-polymer "gesso" to prime a canvas, there is no need to use RSG at all.
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