This has come up many times,,,, Do a search on this ,,,,, There is so much info on it,,,,I have spent hours reading and testing.... Also Poplar is a difficult wood to get sealed right so it does not split,..... Personally,,, If I am going to spend the time making a plug, I would use a better wood,,,, Although some guys have good success with Poplar...
I have spent Many Many Many hours, Lots of different Sealers, Wood hardeners and lots of $$ testing different stuff,,,,Just like I have with clear coats,,, I have done lots of homework and been happy with what I have come up with,,,,
Good Luck....
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