Originally Posted by Gary RVRoamer
Paint "checking" is what sibe described, but the tiny hairlines visible in many high end coaches of the 2000's is technically not "checking". It's an imperfection in the fiberglass composite (from Crane Composites Co) that shows thru the paint. It's a heat-induced failure of the surface, but all the fiberglass experts insist it won't ever allow water penetration. And I mean materials scientists and engineers, not forum pseudo-experts (like me).
My '04 Tradition had it, and so did a friends 2000 Dream. Neither ever developed further problems - just the visible blemish when up close.
Gary great point, being a paint guy among other strange talents.. I need to realize those fibers, hairs, etc are normal and have no effect.. I find them normal and overlook.. most consumers will be alarmed..
Many RV are of the Fiberon or simliar sheet molded composite as well as thicker SMC reinforced with long strand fibers..
These composites will shrink as they "dry" out/age.. The fiberreinforcement material that was almost not visible, tends to show.
There is alot of talk on this all over the web, youtube.....
Being there are many variations in RV consruction Material,, TT/RV C's etc will have the thinner Fiberon styles in a compressed molded panel of interior /insulation/outside all in one sheet..
Then many other have large thicker molded sections of smc or fibeglass styles that are bonded together into a large shell, Mmany of those have a gel coat surface like older boats/corvettes etc..
Then some some in color are processed, wrapped in vinyl or striped etc..
Some are painted and others are hi end custom painted..
Many of the Painted RV's etc that have stripes or many colors are buried in a clearcoat.. This process can protect the panels but in some cases the extra material can cause issues..
The paint film can also shrink and contract or age at a different rate than the substrate.. showing more of the fibers, maybe enhancing the look or small cracks can occur.. Clears can get toasted by UV and split crack, yellow, peels..
There are some incredible coatings that hold up very well and can be applied to be forgiving over odd substrates but they come at a cost and to bad most RV companies may use the lowest bidder that meets their warranty standard...
OK my coffee is over, I need to fire up my paint booth and make some RV fun money...