PETG Layer Lines: Experts Clash Over MEK Vapors vs. Heat Guns for Red Resin Restoration
Increasing top/bottom shell layers to 10 or 15 is the clearest preventative measure to combat visible layer lines on translucent red PETG. Furthermore, applying a clear coat or epoxy resin finish is consistently suggested for final surface improvements.
The methods for restoring color after sanding are sharply divided. Some users, like FuglyDuck, advocate for chemical treatments, pointing toward MEK vapor baths. Conversely, MrQuallzin and BarbecueCowboy favor controlled physical heating—using heat guns or butane lighters to melt scratches—or multi-step sanding regimens involving Plastruct and clear coats. An outlier suggestion from B0rax points to using blue flames on lighters for minor, precise heat restoration.
The consensus points toward layering adjustments for prevention. For post-sanding color recovery, the debate is stark: do you use chemicals for maximum impact, or do you rely on controlled heat application for localized damage repair? General sanding up to 2000 grit is noted as effective for smoothing but risks visible color lightening.
Key Points
Increasing top/bottom shell layers is the primary fix for transparency.
LastYearsIrritant stated increasing layers to 10 or 15 makes the surface opaque enough to hide infill patterns.
Chemical vapor treatments are proposed for color restoration.
FuglyDuck suggested MEK vapor baths, while cautioned against boiling the solvent.
Controlled heat is preferred for scratch healing.
MrQuallzin recommends heat guns or torches to melt scratches and restore light reflection.
High-grit wet sanding is a viable, multi-step finishing approach.
BarbecueCowboy laid out a process using sanding up to 800 grit, priming, and clear coating.
Blue flame lighters offer a specific, controlled heat source.
B0rax provided this specific technique for minor surface restoration, suggesting it's superior to standard torches.
General sanding always risks lightening the original color.
cadekat noted that sanding up to 2000 grit achieves smoothness but causes a noticeable loss of hue.
Source Discussions (3)
This report was synthesized from the following Lemmy discussions, ranked by community score.