One of the joys of Maximaphily is the exchanging with overseas collectors. Many overseas collectors will only accept privately created cards as Post Office produced cards, obtained easily show lack of research when used in exhibits.
Joining the US international MACSU (Maximum Card Study Unit) will give you information about other collectors and an International list of exchange partners. A non-profit organisation, affiliated with the American Philatelic Society.
Creating Maximum Cards using old matte finished postcards presents no difficulty, but the modern, hard gloss finished, postcards test your ingenuity. I have read and tried many methods to prepare gloss finish to take and retain postmarks. Erasers, talc or soft abrasive powders, light scraping with a razor blade are among the many accepted ways of preparing your card.
I am using a method suggested by a thematic friend. I am using "Super Matte" Ceramic Sealer available from some potteries. If used very lightly this seems to work well, even with the poor ink used at some country post offices. However too much dulls the finish of the card and absorbs the ink until it is barely legible, but I still prefer it to the scratched surface some collectors create with their razor blades.
I spray my cards very lightly with a matte porcelain finish then I use sandpaper on the small area I affix the stamp otherwise it will peel off after a couple of months of hot weather.
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