Builders' Forum Archives
Re: Deck 'glass
Posted by LeeG on Jan 19, 2008
The overlap isn't necessary for strength given the sheerclamp is the point for attachment. While it may be nice to have a 10oz "rubrail" the most significant wear will be right on the rounded sheer where it's only 4oz glass.
The idea of wrapping over 1 1/2" inches is just to take in the uneveness of a scissor cut with the ROS crudely fairing in the cured epoxy. Which is great for people who applied the glass evenly and can use a ROS without cutting through thin layers accidentaly.
My take on it is that using a ROS to fair in a 35ft x 1 1/2" strip is a LOT of glass to sand down. Also if you wanted to apply an extra few square feet of 4oz glass there's better places than below the sheer where there's already 6oz hull glass.
What I've done is a similar thing to Laszlos suggestion but to apply the blue masking tape and 2" clear tape over that about 1/4" below the round over of the sheer. Then when the wet out coat is green and one fill coat is applied you wait until the fill coat is fingernail soft or "green". Using a utilility knife or one sided razor blade cut the partially cured glass at a very shallow angle while gently pulling up the two layers of tape as one. The cut with the knife does 40% of the fairing with scraper and sandpaper doing the rest. Then come back with a scraper to fair in the glass more. You may have to dig out some tape that didn't come up neatly. After all the scraping apply two more THIN fill coats but more importantly roll on extra coats over the sheer. Remember to come back to the cureing fill coats and brush out any developing drips. It's the extra thin coats on the sheer that ensure you don't sand down into the 4oz glass. It's a shame to go to all the effort to apply glass and fill coats to only sand right through them just because they're on an edge. If there was ever a place that needed a thick coat of epoxy it's on the edges and not in the middle of flat areas that don't get nicks and hits.
In Response to: Re: Deck 'glass by David on Jan 19, 2008