The thickness of the layer of particle paint sprayed on the surface of a hot-pressed one-piece paddle is the most important factor affecting it.

Some one-piece paddles feel smooth to the touch because they are painted with fine-grain paint or they may not even be painted with grain paint. On the other hand, those hot-pressed one-piece paddles that feel very matte to the touch are sprayed with relatively coarse particle paint. Although the watermark on the hot-pressed one-piece paint also has an impact on the intensity of the matte feel, this impact is very small compared to particle paint.

To answer the question of whether an all-in-one paddle with a smooth surface can pass USAPA, it is worth noting that as long as the value of the paddle is not greater than 30 and the Rt value is not greater than 40, it is a paddle that meets the USAPA certification requirements.

In conclusion, the reason why some heat-pressed all-in-one paddles have smooth surfaces while others feel very matte is mainly due to the particle paint and watermark used.