Hello everyone! I am happy to have found the site and look forward to learning from and sharing with you all.
Being my wife's care giver and attempting to maintain our home at 66yrs. old makes it difficult for me to devote much time to this hobby, that i truly LOVE. This brings me to my question.
Does freezing have an adverse effect on liquid clear? I have a tiny art room in an unheated porch, where I paint in the comfort of a space heater during cold NY winters. The other day (MONTHS after my last dabble with painting) I finally started on a painting of famly property that I have had planned for a long time. I used black gesso on a portion of the canvas that worked and dried well. I applied liquid clear over the entire canvas once dried and began applying color.
As I began to make progress, I noticed that the area previously painted was showing white spots s though the paint and/or clear was not adhering to the canvas. little white lines and spots, almost like a pixilating TV screen.
The worse areas were where I had done a light pencil sketch of two buildings, but the problem was in other areas all over the canvas. This morning (day2) I went to inspect the results, and much of the sky that I had done on phthalo blue had a "crackled" look, like an old mirror.
Yes, the painting was left in the cold porch overnight. Also, the liquid clear as well as the other paints have been out there for over a year.
Pardon my lack of skill and knowledge. Can you please enlighten me as to what happed ad whether it was my fault so I can prevent this in the future? Bob's products are getting ever more expensive and very difficult to fine , so I want to stop being wasteful.
THANK YOU one and all!

Generally what I have seen and tried with painting at negative temps: oil paints are fine with cold; however usage increases as they thicken.

I would assume you applied gesso outside as well. I think this is the reason as it did not dry enough. If I recall acrylics hate cold.

Do gessoing inside at 68 degrees or so. Let it dry few days to allow polymers form properly. Do not store gesso in cold. I had gesso and it was written do not freeze on it. Not Bob Ross brand though. However acrylic based product.
Your gesso may have become damaged.
I cannot say anything about liquid clear. But knowing composition is linseed oil that should not cause any problems.

    Pencil on canvas scratches the surface and may be seen later. So just take alizarin dilute it with thinner. Take old narrow or round brush that has bristles worn out. This can be used as marker in this way and with use of alizarin lightly sketch. If something is wrong you can use thinner to wipe. After sketching is done ( with very thin paint, that looks like pale pink ) let it dry a bit and do not worry as pink does mix well with any other paint.

    only issue with this approach if your canvas pulls paint in. Then that pink will be adsorbed and could be seen through the paint layers.

    but this you will know only after trying your materials, there is too much variability with canvases.

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