Building the "Swiss Army Knife" of Small Boats...Wood Duck Double #32: Amine Blush Setback

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Blog entry by DustyMark posted 07-21-2020 06:12 PM 440 reads 0 times favorited 0 comments Add to Favorites Watch
« Part 31: Tandem Spray Deck and Clamps Part 32 of Building the "Swiss Army Knife" of Small Boats...Wood Duck Double series Part 33: Rudder Pedals and Foot Braces »

Small Disaster
Amine blush is a residue that forms over epoxy as it cures. It must be scrubbed off with hot, soapy water before proceeding with another coat of epoxy or paint. Future coats won’t cure properly over amine blush. Non-blushing epoxy hardener is available at extra cost.

Feathering the rub strip turned out to be a bad idea. I selected regular hardener when I bought my replacement epoxy and should have purchased West System’s special, non-blushing hardener. All of Chesapeake Light Craft’s kits ship with non-blushing hardener. I thought I had done the rub strip with my last bit of non-blushing epoxy…not! All the epoxy I applied last night to feather in the rub strip was only partially cured overnight. I knew my mistake right away. I had to scrape and sand every bit of epoxy off that I had applied last night. That took over two hours working at a steady pace.

I’ll toss the blushing hardener and purchase non-blushing hardener before I use anymore epoxy. It’s simply not worth the hassle dealing with amine blush. These kind of mistakes are unfortunate, but not devastating.

Install the foot pedals.

-- Mark, Minnesota

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