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Ricard,
This is one of the most confusing areas of painting, among a myriad of confusing issues.
Lead is supposed to be the most durable and flexible, but you have let it cure for 6 months or more.
The Artist Magazine, this month, has a good article on sizing and priming canvasses.
Read the standard in the field, Ralph Mayer's book , " Methods and Materials for Artists".
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