It isn't difficult but it isn't logical either. 90% apply it wrong and their results prove it!
Let me teach you how to apply polyurethane without bubbles, puddles runs, or brush marks. I currently have very close to 500,000 views on my video "Fixing Polyurethane Bubbles, Puddles, Runs and Brush Marks". Let's avoid this video by allowing me to be your pesrsonal guide to the step by step right way to apply polyurethane.
My original polyurethane application video has over 1.5 million views and a 95%approval (like) rating. This is a step by step update to the original video.

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0:00 Intro How to apply polyurethane without bubbles puddles, runs or brush marks
0:47 Water vs Oil Based Polyurethane
1:49 Why Fast Drying Polyurethane is bad
2:25 Polyurethane Brush Choices from the really bad to the really good
6:24 Tools and paraphrenalia you'll need to apply polyurethane
6:59 Why you shouldn't use ODORLESS MINERAL SPIRITS to thin polyurethane
7:37 Why polyureythane needs to be thinned
8:15 Thinning polyurethane 3:1 ratio
10:30 Prepping your brush for proper polyurethane application
11:56 Disposing of chemical soaked rags
12:25 Proper brush loading - DIP - DRIP - DAB - DRAG your brush
13:09 Laying down the first coat of polyurethane - drag coating
17:32 What to do with your brush between coats
18:07 Bubbles after polyurethane laydown
18:53 Sanding between polyurethane coats - 220 grit for unstained wood - paper bag for stained surfaces
21:12 Second polyurethane coat
22:50 Summary suggestions and tips

VIDEOS:
Project Preparation:
How to remove paint from wood | Beginner Guide | Part 1 -    • How to remove paint from wood | Begin...  
How to remove paint from wood | Beginners Guide | Part 2 -    • How to remove paint from wood | Begin...  
Chemical Strippers vs Heat Gun -    • Chemical Strippers vs Heat Gun  - Fur...  
Sanding Efficiently -    • Sanding Wood Beginners Furniture Refi...  
Choosing the Right Grade Sandpaper -    • Choosing the Right Sandpaper for Wood...  
Finishing:
How to stain wood | Beginners Guide | Furniture Refinishing -    • How to stain wood | Beginners Guide |...  
Blotch-Free Wood Stain Technique – Refinishing Furniture -    • Blotch-Free Wood Stain Application Te...  
Clear Wood Finish Choices -    • Clear Wood Finish Choices - Refinishi...  
Paul's Combo Finish -    • THE Best Clear Wood Combination Finis...  
About Polyurethane Wood Finish - Refinishing Furniture -    • About Polyurethane Wood Finish - Refi...  
Apply Polyurethane Without Bubbles, Puddles, Runs or Brush Marks -    • How To Apply Polyurethane Without Bub...  
When and How to Wipe On Polyurethane -    • When and How to Wipe On Polyurethane ...  
Ultimate Guide to Bubble Free Varnish -    • How To Apply Spar Urethane  
How to Apply Tung Oil -    • how to apply tung oil tips and techni...  
Clean Up:
Fixing Polyurethane Bubbles, Puddles, Runs and Brush Marks -    • Fixing Polyurethane Bubbles, Puddles,...  
Proper Brush Cleaning -    • Proper Paint Brush Cleaning - Paint, ...  

WEBSITE: https://paulsdiy.solutions/

ARTICLES:
Project Preparation:
Step by Step Guide to Refinishing Furniture
https://paulsdiy.solutions/uncategori...

Sanding Efficiently
https://paulsdiy.solutions/uncategori...

Finishing:
Choosing the Right Clear Wood Finish
https://paulsdiy.solutions/refinishin...

How To Apply Tung Oil Properly
https://paulsdiy.solutions/uncategori...

Blotch-Free Wood Stain Application Technique https://paulsdiy.solutions/uncategori...

Bubble-Free Polyurethane Application Technique https://paulsdiy.solutions/uncategori...

When and How to Wipe On Polyurethane
https://paulsdiy.solutions/refinishin...

Ultimate Guide to Bubble Free Varnish https://paulsdiy.solutions/uncategori...

How to Apply Boiled Linseed Oil - Tips and Technique
https://paulsdiy.solutions/uncategori...