Quote:
Originally Posted by gc1111
I have used Lifecaulk since the 70's as a bedding compound on fiberglass (i.e. plastic) sailboats. It works and works well.
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Me too only my personal choice is 3M 101 Polysulfide but it is one of my favorite bedding compounds other than butyl. I just don't use it on most plastics except fiberglass. I watched a guy destroy a brand new set of acrylic dead lights using Life-Calk a few years ago and he's spent over $600.00 to have them made. The polysulfide literally melted the ports overnight..
Quote:
Originally Posted by gc1111
A blanket condemnation of using it on plastic is inappropriate.
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Here's exactly what I said:
Quote:
Originally Posted by Maine Sail
I agree 3M 101 is a better & thicker polysulfide and it handles UV better. As dog said DO NOT use polysulfide on plastics unless you know for certain it's compatible!
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Here's What Dog said:
Quote:
Originally Posted by sailingdog
Just be aware that you shouldn't use POLYSULFIDE sealants with plastics, as they're generally not compatible. POLYSULFIDE sealants will attack most plastics. BoatLife LifeCaulk is a polysulfide sealant.  |
As I read it, there is/was NO "blanket condemnation" made by either of us and we both clarified that it is not ALL plastics.
Quote:
Originally Posted by gc1111
If it dissolved plastic, my hull would have more holes than could be counted. Maybe you should read your own posts as you make them.
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Um perhaps you should read more carefully?
See above..
In the US most don't refer to fiberglass as plastic in the general sense but rather fiberglass. While it technically is a plastic it is not one that is attacked by polysulfides. There are others that are not too. If you read what I wrote above it is clear that it was a qualified statement not a "blanket statement"!
Some plastics such as some formulations of Lexan, acrylics, PVC etc. may not be compatible with polysulfides. Polysulfides are safe for many plastics but not some of the typical plastic deck fittings, portlights etc.. they are perfectly safe for fiberglass and even some plastics used for through hulls.
Polysulfides are safe for use on GRP/fiberglass but not some other plastics!!