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I've been using PL block adhesive for the last 4-5 years now with very few problems. Only time there is trouble is if the surface is wet or it is cold enough where the block is frozen. If you have slight moisture and freezing temps there tends to be problems.
As for strength, I have had almost no problems with PL since I started and no call backs. I'm not sure how I judge when the surface is too wet or cold to glue. I just now that when the block looks one way or another the glue won't work. More of an experience thing I guess.
Many of the big box stores carry PL brand products. If they don't have the PL block landscape block glue in the green tube, you can also use the red and yellow tube polyurethane glue, that is probably even stronger and seems to work a bit better in damp conditions. The only reason I don't use the poly is it seems to be messier, harder to squeeze out in cold temps, and is a little more money.
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