SignForum — The Sign Maker's Technical Community

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Material Database — Rigid SubstratesPRO: 847 substrates

Substrate	Thickness	Outdoor Rating (yrs)	Printer Compat	Cost	Field Note
Sintra PVC (4mm)	4mm / 0.157"	5yr	UV FlatbedEco-SolventLatex	$1.40/sq ft	Heat threshold 140°F — avoid south-facing installs in AZ/TX
Dibond ACM (3mm)	3mm / 0.118"	10yr	UV FlatbedDirect Print	$3.20/sq ft	Aluminum face bonds well with 3M IJ35 without primer
Coroplast 4mm	4mm / 0.157"	2yr	Eco-SolventLatex	$0.38/sq ft	Overlaminate required for any outdoor > 90 days

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Job Costing Calculator — Channel LettersPRO: All job types

Letter Count12

Letter Height18"

Face Material

LED Illuminated

Quote Breakdown

Material$410

LED Modules (12 letters)$540

Labor (10 hrs @ $85/hr)$816

Quote Total$3046

Gross profit (42%)$1279

Pro tip: At 18" height, space LED modules every 4" on returns > 3". UL-listed modules add ~$8/letter but are required in most commercial permits.

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