whats the best way to reglue record covers

If the cover has any value, an archival glue will be best. You can find it at photo supply stores. They come in stick form.

I just use simple Elmer's glue, (the blueish gel kind, not the white stuff) and just put a thin strip on the same line were the old glue was. The I lay a few heavy books on the edge of the cover for a day or so and they always seem to hold up well after that.

It isn't always necessary to glue the whole seam, just up to where it is coming apart. And your right... These DGG/Philips type import covers do come apart sometimes, but fortunatly there easy to fix.

Wow, I can't believe how much time we can spend talking about glue seams! It's no wonder non audiophiles consider us strange. Of course, paper conservers have week long conferences debating this stuff. In any event, Rubber makes a good point about valuable records. Archival glues are far less likely to cause discoloration with the passing years. Contact cements are not archival, although easy to use. PVA (Polyvinyl acetate) glues like Elmer's white and glues designated as archival are not going to cause any problems. Hot glues are also pretty safe too.