Now the comment which caused all the fuss in the first place concerns filler on GRP.
From my experience no matter how modern or expensive a filler is, it will not contract through hot and cold to as much a degree as GRP. Filler on a metal wing for example there is virtually no expansion and contraction so the filler stays put. The GRP seems to 'breathe' in and out. The thinner it is the worse this gets. The solution is to use where possible fibreglass filler (which expands and contracts closer to the GRP panel) with the thinnest of regular filler to smooth the surface. To be fair the Tribute products are fairly thick (especially the Z300s) but still stick to the process above and you will not get any heartaches.
Another tip is always squeeze the hardener tube from end to end a few times to thoroughly mix the hardener before use. So few do this and it does have any effect (obviously) on the quality of your filler and ultimately the final finish.
Last edited by Nubodi Automotive; 28th February 2016 at 18:16..
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