Inspection of the four sets of impact panels for the different topcoats
showed a distinct failure of Topcoat
B at 40%, with a layer of coating breaking cleanly away from the substrate, whereas the others appeared to pass at 40%.
A handy way to seal and prepare MDF is with Crown MDF Primer (PS14.99 for 750ml, Homebase), which provides better adhesion for the topcoat
and dries really fast - do a couple of coats to cover well.
Remember, if you've got an uneven layer of primer or undercoat, the topcoat
is never going to look good.
Paint specialists at Bombardier's Service Center in Tucson, Arizona, used a three-layer PPG topcoat
system to create a showpiece finish on Carrington's Bombardier Global Express XRS jet.
are supposed to protect the layers below, but if they are thin, pigment loadings are low, and/or UV absorbers are lost, there will be transmission of UV through them.
At Society for Protective Coatings (SSPC) Conference 2012, Kurt Best, senior development specialist, and Ed Squiller, technical director, both of Bayer MaterialScience LLC, detailed the findings of a five-year study comparing some key formulating variables influencing weathering performance of aliphatic polyurethane topcoats
in QUV-A and Florida exposure.
Glasurit offers VOC-compliant topcoat
systems: 90 Line for passenger vehicles and 68 Line for commercial vehicles.
Bayer scientists have developed an engineered polyisocyanate that, when used in conjunction with polyaspartic coatings raw materials, produces a revolutionary topcoat
that addresses application difficulties caused by fluctuating temperatures and humidity.
These basecoats are designed such that they form covalent bonds with the hyaluronan topcoat
, ensuring excellent intercoat adhesion.