Overview Reviews Product Description Ideal for annealing and heat-treating operations, the M and M-10 Paintstiks® mark at room temperature and withstand temperatures up to 1800°F (982°C). Markal - TEMPIL - LA-CO Catalog Product Videos Custom Field Product Reviews Write a Review Write a Review × Markal 12 Pc. Paintstik® Heat Treat Marker - White 81920 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *