Epoxy and spar varnish - Mountain Buzz
 



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Old 07-30-2018   #1
 
Denver, Colorado
Join Date: Jul 2009
Posts: 50
Epoxy and spar varnish

Decided to redo the deck with 3/4 ply, 2:1 epoxy from total boat, and some spar varnish. Sides and top will get both epoxy and varnish but bottom gets only epoxy since it won’t need uv protection. Bottom already has some oil based stain that I was going to epoxy over. Hoping the extra expense and labor are worth it.

Thoughts?

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Old 07-30-2018   #2
 
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Kalispell, Montana
Paddling Since: 1997
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Why not do the bottom in spar varnish as well? Not like you have a ton of area. Plus, it's shinier.


Protip: make sure your epoxy is fully cured before varnishing. Wash it with a 3M pad, hot water and a mild detergent to get any amine blush off the surface. If you have amine blush and it mixes with varnish, it turns into a non-curing, non-drying sticky goo. Slow cure epoxies blush more than fast cure epoxies (fast cure locks up the amine; slow cure it migrates to the surface during curing).


The wash with the 3m pad (or its dollar store equivalent) also gives the epoxy tiny scratches for the varnish to bond to.

Warm the epoxy slightly in the microwave so it's thinner. Easier to mix and penetrates better. Warning: warmed epoxy cures faster in the cup, too! The epoxy I use gets a 6sec nuke for 1oz, 12sec for 3-4oz and 30sec for 16oz.
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Old 08-01-2018   #3
 
boulder, Colorado
Paddling Since: 1983
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I warm epoxy components in buckets of hot water prior to mixing....works well for thinning the resin ....also can add a small amount of acetone or denatured alcohol for a real thin batch after mixing....
check out Raka epoxy....better than West Systems....no amine blush or yellowing with age....and less $$ as well
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Old 08-01-2018   #4
 
Wondervu, CO, Colorado
Paddling Since: 2001
Join Date: May 2008
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I thin regular slow set epoxy adhesive (like devcon 2 ton or West Systems 105) with denatured alcohol about 50/50 or more. I want it really thin, like milk, for deep penetration. No heat needed. Don't be worried if it turns cloudy when mixing, it will clear before it sets.

I brush this on, let it penetrate then follow with additional coats before it gets tacky. The solvent evaporates long before the epoxy cures and it carries it deep into the raw wood.
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