March 12, st Quarter Conference Call 10:00 AM CDT

2 Safe Harbor Statement SPARTECH: FORWARD-LOOKING STATEMENTS This presentation includes "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of “Forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 relate to future events and expectations, include statements containing such words as “anticipates,” “believes,” “estimates,” “expects,” “would,” “should,” “will,” “will likely result,” “forecast,” “outlook,” “projects,” and similar expressions. Forward-looking statements are based on management’s current expectations and include known and unknown risks, uncertainties and other factors, many of which management is unable to predict or control, that may cause actual results, performance or achievements to differ materially from those expressed or implied in the forward-looking statements. Important factors which have impacted and could impact our operations and results include: (a) adverse changes in economic or industry conditions generally, including global supply and demand conditions and prices for products of the types we produce; (b) the ability to compete effectively on product performance, quality, price, availability, product development, and customer service, (c) material adverse changes in the markets we serve, including the transportation, packaging, building and construction, recreation and leisure, and other markets, some of which tend to be cyclical; -continued-

3 SPARTECH: FORWARD-LOOKING STATEMENTS, continued (d) our inability to achieve the level of cost savings, productivity improvements, synergies, growth or other benefits anticipated from acquired businesses and their integration; (e) volatility of prices and availability of supply of energy and of the raw materials that are critical to the manufacture of our products, particularly plastic resins derived from oil and natural gas, including future effects of natural disasters; (f) our inability to manage or pass through an adequate level of increases to customers in the costs of materials, freight, utilities, or other conversion costs; (g) our inability to predict accurately the costs to be incurred, time taken to complete, or savings to be achieved in connection with announced production plant restructurings; (h) adverse findings in significant legal or environmental proceedings or our inability to comply with applicable environmental laws and regulations; (i) adverse developments with work stoppages or labor disruptions, particularly in the automotive industry; (j) our inability to achieve operational efficiency goals or cost reduction initiatives; (k) our inability to develop and launch new products successfully; (l) restrictions imposed on us by instruments governing our indebtedness, and the possible inability to comply with requirements of those instruments; (m) possible weaknesses in internal controls; and (n) our ability to successfully complete the implementation of a new enterprise resource planning computer system. We assume no duty to update our forward-looking statements. Safe Harbor Statement

4  1 st Quarter 2007 Performance  Operating Highlights  Details on Operating Results  2007 Guidance and Outlook 1 st Quarter Conference Call… Presentation Content Note: These slides should be read in conjunction with our 1 st Quarter Earnings Release issued March 12, Abbreviations: M = amounts in millions

5  Operating Results Volumes were lower when taking into account the extra week due to particularly weak November … growth in some key markets helped mitigate weakness in Heavy Truck, Manufactured Housing and RV Material Margin/lb continued to be solid at 35 cents per pound… stable with Q4 and Q1 last year Conversion costs/lb down from Q1 2006…Q1 ’07=24.1 cents, down from 25.1 cents in Q1 ’07, lower labor, freight, & utilities Net Earnings increased to $8.1 million from $5.7 million last year… EPS up to $0.25 from $0.18 Cash flow continued to be strong…setting a record for a first quarter at $17.2 million, up 16% from the previous record set last year Spartech Corporation… 1 st Quarter Performance Highlights

6 1 st Quarter Performance Highlights  Custom Sheet and Rollstock Earnings up to $16.0 million from $12.7 million Comparable sales volume weak at -3%  Hard comparable with last year’s post Katrina surge  Packaging and material handling were very strong Material margin and conversion cost both improved  Color and Specialty Compounds Earnings down from $4.5 million to $4.0 million Comparable sales volume weak at -4%  Automotive weak, Film packaging weak, Roofing strong Poor mix (less color due to year-end inventory de- stockings) drove lower material margins—partially compensated for with better conversion costs  Engineered Products Earnings up to $1.6 million from $1.0 million  Benefited by improved conversion costs on sales down 2%

7 Material Margin Trends Price/Ib Sales Price Material Costs Material Margin st2nd3rd4th1st2nd3rd4th1st2nd3rd4th1st Sales Price Material Costs Material Margin

8  Plant Restructurings…We have sold all idle facilities resulting from the 2005 and 2006 plant restructurings (last sale closing March ’07).  Planned Capital…We have made solid progress on three key initiatives: Greenville Consolidation Ramos Mexico Expansion Oracle ERP  Green Products Growth … Sales of 22.3M pounds in 1 st Qtr of 2007 compared to 19.1M in 2006, up 17%  Working Capital Performance: DSO improved 2.7 days from 1 st qtr ‘06, 52.8 to 50.1 days Inventory turns were 8.9x, down slightly from st qtr of 9.4x Net working capital represents 10.7% of Sales versus 12.9% at 1 st qtr ‘06  Debt Position: Despite higher capital expenditures ($10.2 versus $4.0) and repurchase of shares of $10.4M, only borrowed $3.8M in qtr Debt outstanding of $299M, represents.68 to 1 (Debt/Equity) Availability totaling $241M Other Highlights

9  Revised guidance of $1.55 to $1.62 Without special items Compares to $1.44 per diluted share in 2006 Weaker demand environment than 2006 (Auto, Housing, Heavy Truck) Benefits from 2006 cost reduction efforts and improved freight and utilities Some negatives from Greenville consolidation in advance of 2008 benefits  Growth & Improvement Initiatives Green Products Initiative Greenville Consolidation Mexico Plant Expansion and Growth TPO heavy truck initiative 2007 Initiatives and Outlook

Supplemental Data

11 Customer End Markets – 1 st Quarter of 2007 Company Overview… Diversity of Markets Packaging Food Consumer Medical Material Handling Transportation Automobile Heavy Truck Aerospace Building & Construction Roofing Sanitaryware Windows & Doors Recreation & Leisure Pool & Spa RV Power Sports Marine Appliances & Electronics Refrigeration Medical Equipment Sign & Advertising Outdoor Sign POP Display Graphic Arts Lawn & Garden Lawnmower Wheels Agricultural Implement Building & Construction Recreation & Leisure Other Sign & Advertising Appliance & Electronics Lawn & Garden Packaging & Material Handling 25% 10% 16% 21% Transportation 4% 7% 10%

Market Expectations… High Growth Packaging & Material Handling Material Handling Aerospace TPO Roofing Food Consumer Medical Automotive Sanitaryware Power Sports POP Displays Graphic Arts Agricultural Implements Medical Equipment Refrigeration Automotive Heavy Truck Windows & Doors RV Pool & Spa Marine Outdoor Sign Lawnmower Wheels Refrigeration Medium Growth Weak Recreation & Leisure Transportation Building & Construction Lawn & Garden Appliances & Electronics Sign & Advertising Grey Names = General Market expectations compared to Spartech.

13 Material/Gross/Operating Margins Results Per Pound Sold

14 Cash Flow Trends From Operations and Free Cash Flow

15 Non-GAAP Measures GAAP to Non-GAAP Reconciliation We believe that operating earnings, net earnings, and earnings per share excluding special items, which are non-GAAP measurements, are meaningful to investors because they provide a view of the Company’s comparable operating results. Special items (restructuring and exit costs) represent significant charges that we believe are important to an understanding of the Company’s overall operating results in the periods presented. Such non-GAAP measurements are not recognized in accordance with generally accepted accounting principles (GAAP) and should not be viewed as an alternative to GAAP measures of performance. The following reconciles GAAP to non-GAAP measures for operating earnings, net income, and earnings per share excluding special items used within this release. Amounts are unaudited and in thousands, except per share data.