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  Gelcoat curing and air exposure

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Author Topic:   Gelcoat curing and air exposure
montaukmax posted 10-06-2001 04:16 PM ET (US)   Profile for montaukmax   Send Email to montaukmax  
I've seen several posts on the forum that mentioned the need to cover new gelcoat because it won't cure well in the presence of air. I just bought a Spectrum Color Gelcoat repair kit, and it doesn't mention a need to cover the patch. As a matter of fact they recommend using a hair-dryer to blow air onto the patch and accelerate curing. Any ideas what is different with the Spectrum product? It is gel-coat and uses MEKP as a catalyst.
Tom W Clark posted 10-06-2001 05:09 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The Spectrum gelcoat repair kit does not require covering because it has wax added to it which accomplishes the same thing. Finishing resin that you buy for the final coat on something that is built without benefit of a mold also has the wax added.

It is, in fact, true that polyester resin (without benefit of something to keep air away from it) will stay tacky.

You may use a hair dryer (or heat gun) to accelerate the curing of the Spectrum repair gelcoat because it provides heat, not air, which accelerates the hardening process.

noswah posted 10-06-2001 05:19 PM ET (US)     Profile for noswah  Send Email to noswah     

I just bought a quart of Spectrun Desert Tan
Gelcoat ($68.00) and under "Directions for Application" on my can it says, "Gelcoat hardens on the surface againest the mold but does not harden on the surface when exposed to air. Perhaps the "Patch Kit" is different from regular Gelcoat. Hope this helps.


kingfish posted 10-06-2001 10:30 PM ET (US)     Profile for kingfish  Send Email to kingfish     
It is different. The Spectrum patch kit gelcoat *paste* does not need a release agent; the Spectrum gelcoat does.
bigz posted 10-07-2001 12:40 PM ET (US)     Profile for bigz    
Read my reply to Kingfish under also the information can be found here

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